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Gamma The color models used with image files assume that there is a linear relationship between a component value and the color that appears on the screen In reality, the display devices in use do not tend to respond in a linear manner to the input supplied to them Gamma approximates the nonlinear behavior of these devices It is simply a power function:
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Adjusting the Gamma of an image can be used in conjunction with converting to the XYZ colorspace or on its own Gamma adjustments have a greater effect on the appearance of an image on a computer monitor than does conversion to XYZ and back The effect of the Gamma function is to make component values generally darker or lighter Gamma values greater than 1 make the image darker and those less than 1 make it lighter Notice that the domain and range of the Gamma function are the same If the input to the function is between 0 and 1 the output will always be in that range as well The Gamma value for a display system is the combined Gamma of the components Equation 138 Gamma Combination In other words, the Gamma value for a display system is the product of the Gamma values for all of its components The gAMA chunk allows an encoder to store the Gamma value for a system used to create the image The implementer of a PNG decoder is faced with two issues: What Gamma values should be used to view the image What is the Gamma of the system being used to display the image There is really no way for an application to determine what the viewing Gamma should be In a well-lighted room it should probably be around 10 In a dark room it should be higher, around 15 or so The problem here is that, unless the decoding software has access to a light sensor, there is no way for it to determine this The best choice is either to allow the user to input a Gamma or to use
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a viewing Gamma of 10 Many image display programs allow the user to adjust the viewing Gamma after the image is displayed to get the best results Some high-end display systems allow the system's Gamma to be queried or even adjusted through software If you are writing software for personal computers, you should assume that the Gamma for all of the components other than the monitor is 1 The PNG standard recommends a Gamma value of 25 for monitors if the exact value is unknown 2 Most monitor vendors have this information available even though it is not in the printed documentation The manufacturer says the Gamma value for the monitors in the previous section is 18 Unless you have a high-end display system, a PNG viewing application cannot change the Gamma If the PNG file contains a gAMA chunk giving the Gamma value for the image, that value is fixed as well Since the total Gamma of the display system is Equation 139 Desired Viewing Gamma = Application Gamma Display Gamma File Gamma an application can adjust it by adjusting the pixel values The Gamma correction the application should use is, then Equation 1310 Application Gamma = Applications should only apply Gamma correction to color components Gamma correction is not applied to the Alpha channel
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Interlacing Just as in GIF, PNG supports interlacing of images The interlacing method used in the current PNG standard is called Adam 73 Other interlacing methods may be added in the future, but this is the only one supported now Adam 7 interlaces the image by pixels rather than by rows It divides the image into 8 8 pixel blocks and updates it over seven passes The Adam 7 interlace pattern is shown in Figure 134 Adam 7 is considerably more difficult to implement than GIF's row interlacing Fortunately the pattern contains regular intervals that can be exploited by a decoder Figure 135 shows how a decoder would display an 8x8 block of pixels on the fly using the Adam 7 pattern This illustration makes the regular pattern of the sequence more clear
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The next version of the PNG standard is expected to recommend a value of 22 in order to be compatible with the sRGB standard 3 After the pattern's creator Adam M Costello
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