If "Tone value correction" dialog box, you set the value of the input or "Curves" either by the black or white triangular slider drag or enter a value directly in the input box, you are to say Photoshop, all the pixels in the image change, the new sound value, so that the same as the standard output value. For example, if you move the white slider in the dialog box "Curves" to 250, you say basically "I want all pixels with a value of 250 and higher (i.e. 250 to 255 range), have the same value as displayed in the field output."
As is the standard output value 255 for white, all the pixels in the image with a value of 250 or higher take place, be pure white (value 255). The other light tones in the image will be easier. The same goes for the black slider. If you move the black slider, you set the INPUT value all pixels with this and lower value equal to the standard output value changes is (i.e. black) of 0. For example, if you move the black slider or you set the input black value to 25, are all pixels with a value of 25 or lower on the output value from 0 (black) provided. This is also all the shadow tones to the darkening of lead.
Actually, you are the upper and lower limits of the white and black tones in the image which in this example would increase the overall contrast of the image. So, if you have a low contrast image that still didn't get a black clay and has not got a white tone, you would normally speak his "OK, the darkest tone in this picture has, say a value of 20, but this is not true black and I want it to be black." "Right, so that I must have the INPUT value, set the black slider to 20 and leave the output value with 0."
This changes the value of the selected audio from 20 to 0, which is the depth of the shadow tones. Note that all sounds in the dark areas are proportionally be reduced in value. You have one now either levels or curves sound setting 'has assigned the value of 20 to 0'. Working with the lighter tones now, we say the lightest tone in this same image has a value of 230 (a light gray photos sound, typical for low contrast). Now let's assume, we want the image to a pure white have. So, we need to change the value of this tone of 230 so that it looks white (value 255). Use the levels or curves adjustment dialog we move the white slider until the INPUT value 230 is and let the output value to the default value of 255. This will change all sounds with a value of 230, so that you the new value of 0 (zero) have that white in the image change is.
The result of these two changes to the black and white input values are that the image contrast have increased you, thus it fill the full tonal range and more ' normal' displayed. Now you understand levels as the input values in the dialogs and curves work and correct as you use it, take a picture with low contrast.
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Copyright (c) Les Meehan 2010.
Les Meehan is the author of seven published digital photography books and as a qualified teacher workshops taught for over 20 years.
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