As required, I made an adjustment to a tiff image within Photoshop (CS5), using Curves to simulate a linear image. On examining the new, darker, linear image alongside the original tiff image, it was clear that the histograms were different although, apparently, not as stated in the course material. For the darker image, the tonal values were concentrated strongly to the left (not the right as stated) whereas the original tiff image has a more 'normal' distribution of values. I don't understand this discrepancy.
Applying another Curve to the darker, linear, image, enabled the image to return to that of the original.
The exercise simulates clearly the process carried out within camera but I must be missing something re the histograms.
No comments:
Post a Comment