How to paint accurate grayscale between 0-254 in an alpha or a grayscale image? Seems impossible... Work at 5.5... not in CC. Bug?

So, here's the thing. I have to be able to assign precise shades of gray in an alpha channel, that our code takes the value (between 0-244) and uses it to do its thing. I assumed it would be easy... Simply choose your color and paint... but not so much.

In an alpha channel, or even in a grayscale image, make a selection and fill it with RGB 6,6,6.  Since it does not seem to be a way to get a range of gray tones or the entry for Alpha value is th eonly way I can see of the to do.

Now, use the Info Panel, check that it is indeed RGB 6,6,6.  This is the case.

Now make another choice and fill it with RGB 7,7,7.  Check this box with the info panel and... its 6,6,6.

OK so now use or brightness levels to try to change this until 7,7,7 6,6,6... check with the eyedropper color sampling tool.

What awaits you is what the RGB value of 6,6,6... 8,8,8 at the 10.10.10, it is impossible to make 7,7,7 or 9,9,9. Theres a bunch of other values that are also impossible.

If you do the above in one of the RGB channels if it will work fine... It's just the Alpha and a grayscale image.

On the same vein, on a normal layer, fill an area with you RGB 7,7,7, copy it and paste it into your alpha.  Sounds great... until you use levels to increase the contrast and you find that what has been 7,7,7 is now a mixture of noise filled, I suppose, 6,6,6 and 8,8,8.

(NB. as a note that the foregoing also happened in CS5 but in an old version of Photoshop 5.5, it works perfectly...) I can give the 7,7,7 RGB and the value that is painted is 7,7,7. Put in CC and its fine. If it's just the creation of tones in DC that does not.

In addition, it works fine if you change the individual RGB layers... you can get 6,6,6 AND 7,7,7... but as soon as you copy and paste it into the alpha. .the 7,7,7 found 6,6,6)

Then

1st QUARTER... What am I doing wrong?

Q2... If alpha 8-bit and grayscale images can take on values ranging from 0-254... So how to set the value I want actually?  I can't use the value of K, because it's only a percentage is less than levels and is not a separate entry for the alpha value.

Q3... or more simply... How to set the value of gray for a number in particular, for example. 7

Thank you.

Pat

Post edited by: Patrick Ward

Ok. so with the very patient help of Chris Cox, I understand vaguly what is happening and why.

I presume its because PS is set up for printing, but the problem is caused by the inadequacy of the RGB and gray profiles workspace in the color settings.

The default value is

RGB: sRGB IEC61966 - 2.1

CMYK: U.S. Web Coated (SWOP) V2

Gray: Dot Gain 20%

Spot: Dot Gain 20%

This gray value is not the same gamma as sRGB IEC61966 - 2.1 which is put in place only 2.20. Because conversion occurs when EACH color space conversion, painting in greyscale alpha channel with and the brush color RGB is forced to change the RGB 7,7,7 to a gamma of 2.2 to grayscale to... is worth what ever gamma dot gain20%. What result sin two different values.

SO the solution is to change the gray value to the same as the value of gamma RGB...

Gray: Gray Gamma 2.2


So, it works!

Tags: Photoshop

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