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360
Replies
3
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Closed
I don’t understand what is happening when I do the following.
I open an image of a grayscale, and I go to IMAGE>MODE>GRAYSCALE mode. I create a luminosity mask by clicking on CTRL+ALT+~.
The image now has marching ants outling a portion of the image areas, and it includes everything that is 0% (white) to 50% (neutral gray).
But, the "selection" is not necessarily just the area inside the marching ants, as I believe that creating a luminosity mask creates a mask proportional to the luminance of every pixel, and the mask covers the entire image.
While that mask is still active, if I start hitting the delete key the part that I don’t understand starts happening.
If I monitor the the 50% swatch, each time I hit the delete key, the "K" value drops as follows – 25, 12, 6, 3 indicating that it sequentially becomes one half the previous value.
If I monitor the 90% swatch, each time the delete key is hit, it drops as follows – 81, 73, 65, 58, 53.
If I monitor the 25% swatch, it drops as follows 6, 2, 1
The entire grayscale does of course get lighter each time I hit the delete key.
So my questions are – exactly what does hitting the DELETE key do when struck? It obviously is affecting the luminosity mask, but why do I get the results that I see?
Ron Hirsch
I open an image of a grayscale, and I go to IMAGE>MODE>GRAYSCALE mode. I create a luminosity mask by clicking on CTRL+ALT+~.
The image now has marching ants outling a portion of the image areas, and it includes everything that is 0% (white) to 50% (neutral gray).
But, the "selection" is not necessarily just the area inside the marching ants, as I believe that creating a luminosity mask creates a mask proportional to the luminance of every pixel, and the mask covers the entire image.
While that mask is still active, if I start hitting the delete key the part that I don’t understand starts happening.
If I monitor the the 50% swatch, each time I hit the delete key, the "K" value drops as follows – 25, 12, 6, 3 indicating that it sequentially becomes one half the previous value.
If I monitor the 90% swatch, each time the delete key is hit, it drops as follows – 81, 73, 65, 58, 53.
If I monitor the 25% swatch, it drops as follows 6, 2, 1
The entire grayscale does of course get lighter each time I hit the delete key.
So my questions are – exactly what does hitting the DELETE key do when struck? It obviously is affecting the luminosity mask, but why do I get the results that I see?
Ron Hirsch
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