Help outputing to jpeg

L33tGreg · Post by **L33tGreg** » Fri May 25, 2012 2:37 am

ASP does a lousy job reducing colorspace from 16bpp to 8bpp. I have several photos where the jpg output looks hideous and (16bpp) tif output looks great. If I open the tif in gimp or eog and save a jpeg, it looks fine and is actually smaller than the ASP jpg! I have an example but unfortunately, it won't upload to the board (file size too big). Does anyone know of a way I can improve this situation? I thought about using ImageMagick with an output batch, but I can't figure out the command line. A simple "convert x.tif x.jpg" yields an image just as bad as ASPs.

afx · Post by **afx** » Fri May 25, 2012 7:38 am

L33tGreg wrote:ASP does a lousy job reducing colorspace from 16bpp to 8bpp.

Color space???
There is no bit depth specific color space (though one could easily argue that something as wide as ProPhoto is unsuitable for 8bpp)
What is the actual problem?

I have several photos where the jpg output looks hideous and (16bpp) tif output looks great.

So what are the JPG queue settings? Can you post a screenshot?

If I open the tif in gimp or eog and save a jpeg, it looks fine and is actually smaller than the ASP jpg!

Hmm, mentioning EoG in context with image problems is usually a pointer to a color management problem as EoG is not color managed at all. Puzzling that your gimp results are similar.

I thought about using ImageMagick with an output batch, but I can't figure out the command line. A simple "convert x.tif x.jpg" yields an image just as bad as ASPs.

Potentially yet another hint for messed up CM settings.

cheers
afx

L33tGreg · Post by **L33tGreg** » Fri May 25, 2012 2:27 pm

I'm running Ubuntu 12.04. I have a monitor profile setup in system settings.

The picture in question is of a frog on a pumpkin. The colors are fairly saturated. The jpeg output is using SRGB colorspace witih 95% quality setting. The output, both the color in the frog and the pumpkin is VERY blotchy, not smooth. The conversion from the 16bpp tiff to jpeg using the Gimp looks fine. An interesting point is that the same image in B5 outputs much better (but still poorly relative to the gimp conversion).

Also EoG shows the tiff just fine, so I don't think it's a CM issue.

afx · Post by **afx** » Fri Jun 15, 2012 1:48 pm

L33tGreg wrote:Also EoG shows the tiff just fine, so I don't think it's a CM issue.

No, just the opposite...
As EoG is not color managed, anything that looks fine in EoG is suspect.
Use Geeqie instead.

Can you post the raw&XMP somewhere?

cheers
afx

L33tGreg · Post by **L33tGreg** » Wed Jun 27, 2012 7:21 pm

@afx : You were right. My color profile was not correctly setup.

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Help outputing to jpeg

Help outputing to jpeg

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