View Issue Details
|ID||Project||Category||View Status||Date Submitted||Last Update|
|0011432||Scribus||Graphics / Image Frames||public||2013-02-21 14:28||2013-02-24 19:35|
|Summary||0011432: Duotone – final poor quality|
|Description||There is a strange difference between previewed image when duotone effect is aplied, and the image in pdf result. Pdf is still correct (tested on Acrobat) pdf/x-1a but the overall image quality with the effect is non satisfying.|
in Scribus > looks great
in pdf > looks ugly
CMS is turned ON, icc profile for PC display used.
|Steps To Reproduce||Apply duotone effect to any image (e.g. black and cyan) and export as pdf/x-1a. (Other standards as well.)|
|Tags||No tags attached.|
Duplicate of 0004270.
Image effects are currently applied after color management. When an RGB image is exported to RGB, the effect is applied in RGB colorspace. All is ok. But when an RGB image is exported to CMYK, the image is first converted to CMYK then effect is applied in CMYK colorspace, which can lead to somewhat different result.
In any case, one can not expect RGB to CMYK conversion to systematically preserve colors : the full RGB color range cannot be achieved in CMYK. ICC profiles implement gamut mapping strategy depending on color management settings used. The gamut mapping may in particular not preserve the color luminosity. Try to modify the rendering intent used in color management preferences : "Perceptual" and "Relative colorimetric" is what usually allow to get the best result.
||I am sorry but I have changed color space of the picture to cmyk (cmyktool), tried to change Perceptual to Colorimetric and it is still the same :o/|
Sorry, but given the nature of the problem converting the image will not avoid the problem : the effects is always computed in RGB colorspace for display after color management has been applied, ie after the image has been converted from cmyk to screen colorspace. This is a known issue which has already been reported as 0004270.
|2013-02-21 14:28||Welblaud||New Issue|
|2013-02-21 14:28||Welblaud||File Added: pdf_preview_duotone.png|
|2013-02-21 14:28||Welblaud||File Deleted: pdf_preview_duotone.png|
|2013-02-21 14:29||Welblaud||File Added: scribus_preview_duotone.png|
|2013-02-23 12:52||jghali||Note Added: 0029882|
|2013-02-23 12:52||jghali||Relationship added||duplicate of 0004270|
|2013-02-23 12:52||jghali||Status||new => resolved|
|2013-02-23 12:52||jghali||Resolution||open => duplicate|
|2013-02-23 12:52||jghali||Assigned To||=> jghali|
|2013-02-23 12:53||jghali||Status||resolved => closed|
|2013-02-24 19:13||Welblaud||Note Added: 0029891|
|2013-02-24 19:13||Welblaud||Status||closed => feedback|
|2013-02-24 19:13||Welblaud||Resolution||duplicate => reopened|
|2013-02-24 19:34||jghali||Note Added: 0029893|
|2013-02-24 19:34||jghali||Status||feedback => resolved|
|2013-02-24 19:34||jghali||Resolution||reopened => duplicate|
|2013-02-24 19:34||jghali||Status||resolved => closed|
|2013-02-24 19:35||jghali||Note Edited: 0029893|
|2015-09-17 20:10||Kunda||Category||Graphics / Image Frames => Graphics/Img Frames|
|2015-09-17 20:11||Kunda||Category||Graphics/Img Frames => Graphics / Image Frames|