[argyllcms] Histograms shift when ICC profile is applied

  • From: posts@xxxxxxxxxxxxxxxxxxxxxxxxx
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Mon, 04 Jul 2016 16:58:22 +0200


currently I am experimenting with Argyll and get god results for my Kodachrome target with shaper+matrix. However, one thing puzzles me. The histograms with no ICC-profile applied more or less fill the available range (see attachment 1). However, if I apply the ICC-profile, especially in the red channel, the histograms are shifted towards lower values with a pile-up at the lower end (see attachment 2). Where does this come from and how can I avoid this?


Attachment: histo_no_ICC.jpg
Description: JPEG image

Attachment: histo_with_ICC.jpg
Description: JPEG image

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