Legacy ImageMagick Discussions Archive

Sorry i forgot to paste the command: convert original.tif -profile sRGB2014.icc -define png:exclude-chunk=sRGB original-exclude-chunk-sRGB.png I don't understand why i have to add -define png:exclude-chunk=sRGB to match the colors of my original tif and if it's same to assume that i can add this par...

Hello,

I found out that with the command below i got a really good result, but i don't understand technically what does it change.

Is it safe to assume that i could add -define png:exclude-chunk=sRGB on any conversion of tif to png ?

I think you should convert your tif to sRGB before doing any resizing (-thumbnail). I tried the 2 commands below without success: convert original.tif -profile sRGB2014.icc original-sRGB.tif convert original-sRGB.tif -thumbnail 1280> -profile sRGB2014.icc original-sRGB.png I really don't want to sw...

Hi, Yes, the PNG is slightly lighter than the JPG. JPG compression is lossy, so it is different to the PNG. Thanks for your answer, so you mean i won't be able to obtain the same result for a PNG? I tried to adjust the -quality value since i used 100 before and for PNG it has no meaning following th...

Hello, Thanks for your answers: @fmw42 : thanks to notice me about the quality parameter and their differences. Can it have an impact on the channels ? If so i will try to make some tests and adjusting quality / compression parameters. @snibgo : my problem is that i used IM to do with sRGB tif / jpg...

Small up to see if anyone can help me with my issue

Sorry i had a typo in my command:

convert original.tif -thumbnail 1920> -quality 100 -profile sRGB.icc original.png
convert original.tif -thumbnail 1920> -quality 100 -profile sRGB.icc original.tif
convert original.tif -thumbnail 1920> -quality 100 -profile sRGB.icc original.jpg

To resume: Conversion from CMYK tif to: sRGB png -> lighter (convert original.tif 1920> -quality 100 -profile sRGB.icc original.png) sRGB tif -> OK (convert original.tif 1920> -quality 100 -profile sRGB.icc original.tif) sRGB jpg -> OK (convert original.tif 1920> -quality 100 -profile sRGB.icc origi...

Hi, you can find the results from the conversion in png and jpg here: https://lion.box.com/s/k5hrvy275h20z131i8awufdbsqvdudnd jpg Red: mean jpg: 106.595 (0.418019) mean png: 106.582 (0.417968) Green: mean jpg: 128.429 (0.503641) mean png: 128.419 (0.503603) Blue: mean jpg: 113.996 (0.447042) mean pn...

Hi, I understand your argument. But i just found that when i convert the CMYK tif to a sRGB tif the colors are kept. But when converting the resulting tif sRGB in png, the colors are more bright. The same conversion from CMYK tif to sRGB jpg went fine. So from my understanding this does not seems to...

Hi, The problem is when displaying the original tif and the converted png on my screen the colors are different. The convert png image is more bright than it's original tif. I don't have this issue when converting using nconvert tool for example: nconvert -icc -out -o original.png original.tif I don...

Hi, The original tif : identify -verbose originalFL.tif Image: originalFL.tif Format: TIFF (Tagged Image File Format) Mime type: image/tiff Class: DirectClass Geometry: 8424x5616+0+0 Resolution: 600x600 Print size: 14.04x9.36 Units: PixelsPerInch Type: ColorSeparation Base type: ColorSeparation Endi...

Hi, I'm getting stuck trying to understand why i have a brightness issue while converting some tif to png. Does anyone have a clue about how i could solve it? Command : convert original.tif -thumbnail 1920> -quality 100 -profile sRGB.icc original.png Color Profile: www.color.org/profiles/sRGB2014.ic...