GaMapICC example: "Red Flowers" © Phanuphong Paothong / stock.xchng

Original (AdobeRGB) – ISO Coated v2 (ECI) rel. w. BPC – ISO Coated v2 (ECI) perceptual – GaMapICC 0.1 – GaMapICC 0.3b – GaMapICC 0.5

This example shall demonstrate the advantages and drawbacks of GaMapICC / ArgyllCMS. Please use a color-managed web browser[1] to view it.

Please note: The gamut of the original image exceeds ordinary display gamuts. There is a blazing pink area between the red part and the white center of the flowers you can't assess reliably on a sRGB monitor.

However, the red part of the petals should be assessable also on many typical monitors.

What I noticed:

• The greens and unsharp transitions between red and green are very good in the GaMapICC 0.1 version IMHO.
• There is an unexpected loss of details in the red part of the petals in the GaMapICC 0.1 version.
• GaMapICC 0.3b provides a significant improvement.
• The GaMapICC 0.5 result is also acceptable (there is some loss of details compared to GaMapICC 0.3b, but 0.5 provides advantages over 0.3b in several other cases)

The commands I used to produce the GaMapICC version were:

• tiffgamut -ir -pj -cmt '1085826_10236297.tif' '1085826_10236297.tif'
• collink -ke -cmt -dmt -ip -G '1085826_10236297.gam' '1085826_10236297.tif' 'ISOcoated_v2_eci.icc' 'Adobe RGB (1998) -cmt ISO Coated v2 (ECI) -dmt.icc'
• cctiff -d 'ISOcoated_v2_eci.icc' 'Adobe RGB (1998) -cmt ISO Coated v2 (ECI) -dmt.icc' '1085826_10236297.tif' '1085826_10236297@ISO Coated v2 (ECI)(is100).tif'

The JPGs on this page are downscaled and transformed back to AdobeRGB using rel. col. w. BPC.

Klaus Karcher, October 2008 / latest update January 2010

[1] Firefox 3 with gfx.color_management.enabled=true or Apple Safari.