09-30-2020, 12:43 PM
Afternoon,
Newbie here, what do the clamp input/ output tick boxes do in levels? I cannot see a difference on a 16 bit raw to tiff image that I play around with from time to time, ticking and unticking the input checkbox and looking at the preview histogram.
https://docs.gimp.org/2.10/en/gimp-tool-levels.html has no information and
clamp input has the mouseover text "Clamp input values before applying output mapping" and Clamp output has "Clamp final output values", both message seem to suggest that I am missing some critical piece of knowledge. I am aware the histogram is a representation on the tones or colours in an image and that levels alter the relative values on a mathematical way to alter the proportion of said tones to the human eye (as the computer does not care if big chunks and posterised splits appear in the histogram), but what is being clamped to what?
Philip.
Newbie here, what do the clamp input/ output tick boxes do in levels? I cannot see a difference on a 16 bit raw to tiff image that I play around with from time to time, ticking and unticking the input checkbox and looking at the preview histogram.
https://docs.gimp.org/2.10/en/gimp-tool-levels.html has no information and
clamp input has the mouseover text "Clamp input values before applying output mapping" and Clamp output has "Clamp final output values", both message seem to suggest that I am missing some critical piece of knowledge. I am aware the histogram is a representation on the tones or colours in an image and that levels alter the relative values on a mathematical way to alter the proportion of said tones to the human eye (as the computer does not care if big chunks and posterised splits appear in the histogram), but what is being clamped to what?
Philip.