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I have had this effect when I use “Levels” on Photoshop. If you start
with a flat image and need to move the sliders in from both extremes to get good
blacks & whites then you reduce the number of grey levels to print, hence
posterisation. I have found it always best to convert any image to 16 bit (or
even 24) before starting any changes.
Similar effects occur if you use to much compression with jpg files.
Start again with the original file. (Hope you did not change it, then
save to same file name, hence losing original information.)
Regards,
Jim Thyer
Hi,
I have bmp image files that show these “steps” in gray levels. Hints as to
why this happens and what might be a corrective action to take?
Andy
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