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I’ve just noticed something rather odd. Am I going nuts, do I need to delete my preferences or is this universal?. Can anyone else replicate this? And if they can, is there any good reason for this difference in behaviour between 16 and 8 bit mode?
The behaviour:
1.On an 8 bit RGB image, load the RGB channel as a selection (option-command-shift-~ click on the image).
2. Image/adjustments/levels – the histogram shown in the levels dialogue will be just the histogram of the selected portion of the image.
3.Hit cancel and then add a levels adjustment layer, same selection. Again the levels histogram shows just the histogram for the selection.
4. Now repeat the exercise on a RGB 16 bit image. Same selection, use Image/adjustment/levels – the RGB histogram in the levels dialogue gives same result as with eight bit – histogram of the selected pixels only.
5. But with a levels adjustment layer in 16 bit mode the levels dialogue shows the histogram of the whole image…NOT just the selected pixels…
(and yes this is of vaguely practical importance to me!)
I’m using CS on a 600Mhz G3 imac, 756Mb RAM running 10.3.4. In case that makes a difference.
Susan S.
The behaviour:
1.On an 8 bit RGB image, load the RGB channel as a selection (option-command-shift-~ click on the image).
2. Image/adjustments/levels – the histogram shown in the levels dialogue will be just the histogram of the selected portion of the image.
3.Hit cancel and then add a levels adjustment layer, same selection. Again the levels histogram shows just the histogram for the selection.
4. Now repeat the exercise on a RGB 16 bit image. Same selection, use Image/adjustment/levels – the RGB histogram in the levels dialogue gives same result as with eight bit – histogram of the selected pixels only.
5. But with a levels adjustment layer in 16 bit mode the levels dialogue shows the histogram of the whole image…NOT just the selected pixels…
(and yes this is of vaguely practical importance to me!)
I’m using CS on a 600Mhz G3 imac, 756Mb RAM running 10.3.4. In case that makes a difference.
Susan S.
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