The ash card can assist the digital camera and the camera
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1. A 18 mennon grey card not only have the use of measuring the camera exposure value also be able to adjust color balance and revert the color truly and perfectly by controlling the grey balance in digital photography Mennon grey card is a guarantee for photographing high quality pictures is a necessary assistant for photographers 2 How To Use mennon Grey Card In digital photographing refer to Mennon Grey Card and Digital Photography Exposure Value Determining Set the photometer in measuring reflected light mode take off the white light transmittable shade You should use mennon gray card in the same light as your subject for getting a precise exposure value The distance between the lens and the grey card should be at least 15cm longer to prevent the lighter ray or shadow from causing influence during measuring When you photography indoor you should use the grey card in front of the subject as close as possible 1 http Awww emenon com while turning the grey surface of the grey card slowly to form a certain included angle and angle of elevation among the grey card camera and light source The included angle between the subject and light source generally should be a 30 45 Isosceles triangle The grey card should directly face to the camera and the main light where is at 1 3 of the included angle that is formed by the camera and the main light How you place the light Usually the side light should be more cl2. Awww emenon com For this to know the principle of neutral grey and correctly use grey card in digital photography are very important Owing to the highly demand in professional fields like advertising printing and exhibition all pictures need to be further adjusted after producing That is not only a complicated and meticulous work also requires the editor to have professional skills and sensitive senses to color It will be a good beginning for further adjustment work if we can get a picture with fewer defects Although Photoshop can make up for defected pictures with superfluous adjustment it also has the possibility to cause color and detail losing Thus it s always necessary to get high quality pictures as much as possible during photographing We advise that the photographers should better to use a grey card to control the color in the beginning of photographing for half effort and double results Direction for Use 1 Directly measure the color info from the grey card with a photometer or a digital camera 2 Photograph a part of grey card on the same picture with the scene subject together 3 Photograph the grey card with full frame so that it can be a digital grey card You must use the same light to photograph the pictures that were mentioned above And there should not be any shadow or strong reflection on the grey card With the recorded neutral grey use the related tools in Photoshop to achieve the purpose of color rev
3. Digital image is often affected by temperature and sensitivity once the color temperature is changed in scene or the light source is out of the WB range the color of image will be out of balance There is a best way to achieve color balance under complex color temperature if you use the manual white balance mode and measure the grey balance in scene by using mennon grey card We just take Nikon D70S which has a great market share as an example to simply analyze the using principle between Nikon D70S and mennon grey card There re almost the same working principles for other brands Nikon D70S has set the range of automatic white balance between about 3500K 8000K as default Within this range you nearly will get accurate colors But why not ABUSOLUTE accuracy That because the ability of CCD has not yet managed to revert color back as the color temperature changes The CCD just imitates a similar color temperature of scene by using several color temperature vales which were set in advance in the camera The color temperature can reach the good effect of 3000K 6000K Take Nikon D70S as an example if the color temperature in scene is lower than 3000k the camera may set a higher temperature to make the image colder And if the temperature is higher than 6000K the camera may give a lower temperature to make the image warmer Because when CCD image sensor is close to the maximum of measuring range the precise value of measuring will be reduced
4. on the object s Attention the color which is measured by grey card is the true color of the present scene If the color is measured under the natural light it must be the color temperature of natural light if the color is measured under the artificial light then it ll be the color temperature of artificial light In a word with a grey card the scene will be reverted to its PRESENT color but the present color temperature won t be changed It s also convenient to help you add light atmosphere or even mood to your works in case that you want to express colorful artificial lights and morning or evening glow Using grey card in dark room A series of color differences on pictures might be produced during photographing due to the different lights and color temperatures in scene So it is a necessary work for photographers to adjust pictures with softwares f i Photoshop though it is very complicated to do well Now the grey card brings you a new idea to solve this problem You need to do these things 1 Photograph a grey card on one of pictures Picture A 2 Use another grey card to measure present white balance value in scene 3 Photograph your subject 4 After photographing download the pictures to your computer 5 Use Eyedroppe Tool of Photoshop to pick up the color value from Picture A which contains the grey card 6 It ll be perfect to obtain the same color effect with Picture A by using the Replace Color tool You can appl
5. those series of numbers Thus it will be excellent and precise to take 17 68 approximation of 18 as a base value which controls the exposure value photographic density and color balance In manufacturing of photosensitive products 18 grey had become a standard in theory because of its special characteristic 18 grey as a foundation used in the photographic sensitivity of the film the exposure value of exposure photometer CCD and CMOS sensors Reflectivity of the Light Spectrum of mennon Grey Card The light wavelength diagram below is in unit of nanometer with it you see the reflectance density of mennon grey card http Awww emenon com reflectance reflectance densit 400 500 600 700 light wavelength in unit of nanometer mennon Grey Card Technique Data Product Function use of measuring the exposure value color balance light ratio Actual Reflectivity about 17 8 on grey surface and 92 on white surface Deviation of Light Measuring lt 1 8 diaphragm Deviation of Reflectivity 2 Material of Product high density composite paper based material Size 8x10 6x8 4x6 Pack standard hardback
6. to the color changing the color components of the ray can be clarified The way to measure the color temperature had been invented by physicist Kelvin in 19 century He had a series of methods in color temperature measurement The exact standard of measurement is based on the wavelength from a blackbody radiator The unit of color temperature is the symbol K which is defined from the first letter of Kelvin The common iodine tungsten lamp has standard 3200k and the sunlight at noon is 5600k they are white balancing standards for tungsten and daylight Hint the Color temperature K temperature C So what s the relation between the color temperature and grey card neutral gray in digital photography In photography field 5500k is regarded by experts as professional standard color temperature meanwhile it is also an ideal white light But exactly speaking the white light will only be true white light when the three primary colors reach to R G B 1 1 1 In another word to vividly express the true color of nature the light must be balanced and neutral 18 grey The three basis color must be absolute balanced to express the real color Based on this principle neutral grey is not only a standard for CCD to get and process colors but also a color correcting standard for Photoshop The neutral grey plays an important role in color field and digital photography No neutral grey no true color And all colors are determined by neutral grey http
7. a lot At a sunny day morning around 10am the actual color temperature in scene will be about 4300K In an usual condition the WB should be set to Sunny mode meanwhile the corresponding color temperature which is set automatically by camera will be 5200K you can also turn sunny mode to 4800k by fine adjusting function Even so there are still 500K difference in temperature between the camera and the actual scene In this condition the color temperature of the camera is higher and the image will appear to be a little bit colder and vice versa The Changes of Color Temperature In Different Conditions amp WB Setting for Nikon D70S http Awww emenon com Candle light Incandescent Rise Set Light Sun rose Incandescent Fluorescent Light 40W Light 2 hours 10 00am Incandescent 2 00pm Fluorescent Photoflash Light RGB At noon Fluorescent Light Sunn Cloudy Photoflash In shadow Mostly Cloud In Shadow Note the relative data is originally from Kodak and Nikon You will find from the table that the WB setting of Nikon D70S still has some light differences with the actual color temperature For that if you try to get color balance it will be a good solution that you use manual white balance mode to measure the grey value from the grey card Methods of Setting Grey Balance for Nikon D70S 1 Turn the camera power on Spin the camera knob while holding WB until you get to PRE Release the butto
8. actor MHD Picture size M f scale value of lens diaphragm Subject size How to use the exposure factor exposure factor x calculated exposure time White Balance Determining Generally most video cameras have automatic white balance function which can manage to photograph in most of scenes However under a complex mixed light this function cannot really keep the color from being out of balance http Awww emenon com The white surface of mennon grey card can reflex about 90 of incident lights For a more precise color you just need to measure the white surface by using manual white balance function Set the video camera in a corresponding white balance mode indoor or outdoor with the present scene Aim the video camera at the white surface of the grey card and then push WB button to record this value You can apply the same method on digital video cameras and film cameras which have manual WB function Examination of The Photometer of Camera Mennon grey card can examine whether the value that recorded by camera photometer is correct During examining make sure that your photometer is fine and the examination should be done in the same light condition Set the photometer in measuring reflected light mode take off the white light transmittable shade Set a random speed value for the photometer f i 1 60 s Face the photometer to the grey surface of the grey card and then measure and record the diaphragm value Set t
9. e Once grey balance is determined other colors will also be balanced To use a grey card during digital photographing is a fastest way to achieve image color balance If you control the color balance appropriately before photographing then the image correcting in the later period will be very easy Otherwise it Il be hard to fully revert an image which is out of color balance During the later period correcting the less correction you make the less image damage will be caused The essential of using grey card in color correcting is to enhance the efficiency of work and reduce the possibility of color damage http Awww emenon com Using grey card in photographing Put the grey card on the place in which the subject is and be sure that the light natural light or artificial light is from the same direction with the digital camera Set your camera in manual white balance mode Use AEL function to measure the reflected light on grey card grey surface as the same time the distance between the camera and grey card should be kept in about 15cm away Re composition and re photograph after the value has been fixed Then you must get the true color of present scene To photograph a subject which seem to be far such as the scenery the long range view the beach and the snow scene you can directly aim the digital camera at the grey card grey surface to measure the grey balance But the light on grey card must come from the same direction with
10. he speed value of the camera to 1 60 s Measure the value from the grey surface of the grey card If the diaphragm value that the camera gets is the same with the photometer s then the camera light measuring system is fine Notice the allowed difference that the camera measured should not be more than 1 3 diaphragm with the value that is measured by the photometer Otherwise it might cause an incorrect exposure 3 Tips of mennon grey card in usage Mennon grey card is made of high density composite paper based material There s a special coating covered on the grey card which has the use of controlling the reflection ratio When use it be careful that it will not be folded and keep it from the water sharp stuffs splotch and sweat If there s a light splotch or sweat on the grey card use a piece of chamois to wipe them up A very light notch will not influence the reflection ratio of grey card http Awww emenon com Practical Use of mennon Grey Card In DCs ANN mennon Copyright mennon Nowadays there re several white balance WB functions exist inside most of digital cameras which are made for the purpose of color temperature adjustment and color balancing The CCD CMOS image sensor of digital camera is a device which is similar with the human eye It gets the color balance through digital data that are processed by CPU However compare with the human eye the sensitivity of the image sensor CCD CMOS is much worse
11. http Awww emenon com mennon Grey Cards And Color Balance Copyright mennon A Grey Card has the use of supporting the white balance function of Digital Cameras and Digital Video Cameras recording and accurately revivificating the true color of the image That is related with the special feature of the color temperature of grey card The Color Film is designed on the basis of color temperature differences There re many types of film such as daylight type tungsten type etc DCs and DVs can adjust the different color temperatures through their white balance function During photographing the color in scene will be reverted as long as you ve made the color temperature balance Therefore to get the true color in video and film production it s necessary to understand the relation that between the color temperature and grey white balance That s so called color balance The color temperature is specialized to measure different colors from the ray Generally speaking it is the process of color changing as an absolute black body reaches to a certain temperature For instance to warm up an absolute black body under the vacuum condition f 1 The process of striking an iron from absolute zero As the temperature rises the black body will glitter with different lights At 3200 C the light appears to be light orange and at 5600 C the light is nearly white The higher the temperature rises the lighter the color light will be According
12. io the color tone will be out of balance and the picture layers will be damaged With mennon grey card you can determine the light intensity ratio of present scene The using steps are as following A Record the main light value use the grey card in front of the subject as close as possible turn on both main light and side light black light is not included Adjust the light angle of the grey card to the main light Measure the value on grey card by an exposure photometer Record the value as the max number is showing on the photometer B Record the side light value use the grey card in front of the subject turn off the main light and turn the grey card exactly to the camera lens Measure and record the value on grey card by a photometer By calculating the class difference of two values you ll get the light ratio of the scene On this table below there re the light intensity ratios of using full light and using side light alone Exposure i Exposure Light Class difference Class difference Ratio Color Balance Determining and Density for Printers Mennon grey can determine the color balance of pictures Photograph a part of grey card with the subject together on one picture or photograph the grey card in full frame Compare the printed picture with the real grey card by eyes or a color analyzer then you can simply judge whether the color is balanced or not Take a transparent positive picture or a negative pic
13. ivification For more details please turn to Mennon Grey Card User Manual doc Remember the following principles during color correcting for pictures 1 Color bias will NOT only exist in some certain colors on the picture thus all colors should be adjusted 2 When a picture has potential color bias the part of light tints should be examined first 3 As 18 neutral grey is the most accurate color it should be first considered to use in the color bias correcting 4 The color complements should also be adjusted as much as possible during the color correcting 5 Depends on the exact needs of the picture HLS mode is needed sometimes http Awww emenon com mennon Grey Card and Digital Photography Copyright mennon Mennon grey card Standard pack is a specialized grey card for digital photography It designed based on ISO standard and combined with customers preference of colors An early grey card was only used for measuring the exposure value which might have produced a light difference during measuring the color temperature that mostly appeared to be a cold color To revert vivid color back in scene based on 18 grey mennon grey card has contained traces of color element that is more suitable for digital photography That makes mennon grey card work effectively in balancing color temperature In digital photography there re several methods in controlling color balance In general you either use WB function
14. n Press and hold the WB button again for several seconds until it makes PRE blink which informs that you can start to set manual white balance mode Point the camera at the grey card and press the shutter If Gd flashes on LCD you re successful If nG not good flashes try again 2 When you measure the grey value be sure that the light source and the irradiation angle are the same with where the subject is The distance between the lens and the grey card should be at least 15cm longer Try to shot the grey card in full screen as full as possible There should not be any shadow on the grey card meanwhile 3 It is not related with the focus length when you measure the grey balance You can switch the auto focus AF to manual focus MF and set the focus length to unlimited distance That purpose is to make the grey card be more mild It s better to close exposure compensation for fear that it might interrupt during measuring http Awww emenon com Technical Features of Mennon Grey Card ANN mennon Copyright mennon 18 grey is used in the grey card as a base color Both grey and white surfaces of the grey card have their own function Whatever you used in film or digital photography an 18 grey card can control expose value and balance the color so that it helps to revert the color truly and perfectly by measuring the exposure value white grey balance value and color temperature A grey card had been invented based on
15. of your digital camera or edit the picture in the later period production by using Photoshop or some related softwares But the easiest way to adjust color balance is to use an 18 grey card directly Modern digital cameras offer several white balance functions that are enough to meet the needs of normal use However the CCD sensor could not 100 revert to the true color of the image especially under a complex light condition since it hasn t obtained the same ability in color balancing compare with the human eye That because the light in scene goes beyond the default setting of CCD When the light in scene is too dark too bright or the light changes suddenly the color temperature will be changed that will make the color go out of balance Such as people often photographed grey snow from white snow scene That s why professional photographers would like to use a grey card to set manual white balance or grey balance for the subject scene Normally digital images need to be adjusted in computer in the later period production This work is a professional technique because of the complicated process of adjusting color balance For instance by using the Curves Tool of Photoshop to adjust the color balance is a good way During adjusting you first should adjust R G B curve to correct color casts from different directions but the calculation is too complicated to work efficiently R G B curve adjustment is actually a process which corrects the grey balanc
16. oser to the light axis of the camera f 1 See the picture below aim side light Under the natural light you can measure values that either use the grey card on where the subject is or on where the camera is as long as you make sure that the light intensity on the grey card is the same as on the subject If you shoot on a cloudy day or under a low light environment you can use the light from the sky or portable outer scene light or reflector as light source to help you in measuring the exposure value For a precise exposure value sometimes you need to appropriately adjust the diaphragm or speed value depends on the different condition of scenes That demands an experienced photographer If the color of subject is dark you should increase 1 1 2 diaphragm for increasing layers on dark coating of the subject and vice versa You do not need to adjust the subject if it is in normal contrast ratio We suggest photographers only to use bracket exposure in cause that you are under back light or the contrast ratio is very extreme http Awww emenon com Light Ratio Determining Between Main Light And Side Light Definition of light ratio determining between main light and side light the light intensity ratio between the main light mixes up the side light and the side light alone In normal condition the light intensity ratio on a color picture will not be over 3 1 on a black white picture it won t be over 5 1 Up to this rat
17. the optical principle and the characteristic of photosensitive film The camera exposure value is in direct ratio with the logarithm of characteristic curve Characteristic curve shows two important features of photosensitive material they are contrast factor and exposure latitude and it is in coordinate with the sense of human sight in reflection to the colors in ray When color changes as geometric progression its density will change as arithmetic progression If we try to get a series of density values like 1 2 3 4 5 the exposure value will be increased like 1 2 4 8 16 always in multiple If we set the reflection ratio to 100 as maximum and decrease progressively as common ratio of 2 we ll get the density value of full level diaphragm 100 50 25 12 5 6 25 3 125 if the reflection ratio decrease progressively as square root of 2 we ll get the density value of half level diaphragm 100 70 71 50 35 36 25 17 68 12 5 8 84 6 25 4 42 3 125 Actually those values are just different grey values in different grades We take it that the standard exposure value is 17 68 then those values beside it will be its exposure latitude Look at those density values above from number 100 to 3 125 the ratio is 32 1 The exposure latitude in this ratio is exactly included in the photosensitive range among in color negative black white negative color reversal film and CCD We ll see that 17 68 is just right in the middle of
18. ture for grey card that will help the printer to determine 3 http Awww emenon com the best color balance and density The image of grey card is referable as a standard for color printing Grey card photographing is a process that is equal to record the light color in scene Different light colors will directly cause different results in color printing To express an absolute grey value is a hard job for most of color films That s why to balance colors between pale pink and neutral color are hard to achieve If you make grey color a little bit lighter than neutral colors in printing you ll get color balance for all pictures The image of grey card is the best neutral referential object for measuring the density It helps to determine the color and the density of black white negatives color negatives positive pictures and printed pictures by eyes and by the color densitometer Exposure of Near Shooting And Exposure of Reprint Photograph determining Put the grey card on the same horizontal with the subject which will be reprinted Set the film speed of the photometer and the camera to the same level as the negative s Measure the exposure value along the direction of camera optical axis If the distance between the subject and the camera is less than 8 times of the focus distance of lens you should increase the exposure value But that is not necessary if you use a TTL camera Formula Effective diaphragm f f M 1 or exposure f
19. y the same setting to all other images Other softwares have their own methods to accomplish the same thing In this way you find the advantage is that you can ignore the color balance of other pictures during photographing The only thing you need to care about is just to compose and photograph carefully http Awww emenon com Digital Grey Card To make a digital grey card you need to photograph a normal one and save its picture into your computer During photographing a grey card you should set your camera in manual white balance mode keep an appropriate distance meanwhile photographing the grey card full framedly with perpendicular the camera to grey card to form a 30 angle with the sunlight grey card and camera There should not be any shadow on the grey card The ideal light condition to photograph grey card is under natural light at a partly cloudy noon http Awww emenon com mennon Grey Card Manual ANN mennon 1 Introduction of mennon Grey Card An excellent picture is produced with the precise exposure If the light in scene is excessively bright or dark exposure deviation might be produced Mennon grey card can balance all mixed lights to be 18 neutral grey With a photometer you ll get precise exposure value by means of recording the light that was reflected from the grey card Mennon grey card can measure the exposure value through the exposure photometer the TTL SLR camera and the digital camera etc
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