PatchTool OSA UCS

comparing two devices gamut

BabelColor ®
Color Measurement and Analysis
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In these screenshots we compare the gamut of the sRGB and Adobe RGB color spaces as viewed in the UCS L=2,5 plane. We first generated a UCS color list with a fine pitch of 0,5. For the wide j and g ranges selected, this resulted in a list with 8649 patches. We then removed all patches which are outside of the respective sRGB and Adobe RGB gamut using PatchTool's "Gamut Tools / Clip Check" (See the previous screenshots page for the dialog used to generate the color list). The light grey zone at the right of each image corresponds to colors located outside of the visual spectrum. The medium gray zone around the colored patches corresponds to colors outside of the respective RGB spaces but still within the human visual gamut. The difference in gamut can be directly assessed by comparing the relative area covered by each space because the UCS is scaled more uniformly; such a comparison would produce a significant error with most other color spaces, including L*a*b*. Note: While the larger gamut of Adobe RGB is “real”, the extra colors can only be appreciated on a wide-gamut monitor, and when looking at these color lists in a color-managed application, such as PatchTool. For Web display, the colors in the screenshots shown above are limited to the sRGB space. The procedure to obtain these images is detailed in Appendix F of the PatchTool Help manual, which contains a detailed description of the UCS (Appendix F can also be downloaded as a separate document; look for the AN-7 Application Note in the Tutorials page).

PatchTool OSA UCS

comparing two devices gamut

BabelColor ®
In these screenshots we compare the gamut of the sRGB and Adobe RGB color spaces as viewed in the UCS L=2,5 plane. We first generated a UCS color list with a fine pitch of 0,5. For the wide j and g ranges selected, this resulted in a list with 8649 patches. We then removed all patches which are outside of the respective sRGB and Adobe RGB gamut using PatchTool's "Gamut Tools / Clip Check" (See the previous screenshots page for the dialog used to generate the color list). The light grey zone at the right of each image corresponds to colors located outside of the visual spectrum. The medium gray zone around the colored patches corresponds to colors outside of the respective RGB spaces but still within the human visual gamut. The difference in gamut can be directly assessed by comparing the relative area covered by each space because the UCS is scaled more uniformly; such a comparison would produce a significant error with most other color spaces, including L*a*b*. Note: While the larger gamut of Adobe RGB is “real”, the extra colors can only be appreciated on a wide-gamut monitor, and when looking at these color lists in a color- managed application, such as PatchTool. For Web display, the colors in the screenshots shown above are limited to the sRGB space. The procedure to obtain these images is detailed in Appendix F of the PatchTool Help manual, which contains a detailed description of the UCS (Appendix F can also be downloaded as a separate document; look for the AN-7 Application Note in the Tutorials page).
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