Search found 37 matches

by Lars-Daniel
2016-10-06T17:07:37-07:00
Forum: Bugs
Topic: JPEG: issue with sampling-factor
Replies: 10
Views: 11699

Re: JPEG: issue with sampling-factor

Is there a way to contact the developers?
by Lars-Daniel
2016-10-02T15:54:25-07:00
Forum: Bugs
Topic: CMYK to sRGB: issue with profiles
Replies: 12
Views: 8770

Re: CMYK to sRGB: issue with profiles

I've extracted the ICC profile from repro.tif ... This means: I've extracted it from the image to verify that it's the same as in my directory. "Extract", neither "remove" nor "delete" ;) I'm confused. Does repro.tif contain an embeded profile or not? Sure it does: identify -verbose repro.tif | gre...
by Lars-Daniel
2016-10-02T15:26:37-07:00
Forum: Bugs
Topic: JPEG: issue with sampling-factor
Replies: 10
Views: 11699

Re: JPEG: issue with sampling-factor

IM may not allow downsampling for TIFF with JPG compression. I do not know. There does not appear to be any information either way about it at http://www.imagemagick.org/script/formats.php I bet it's a problem of using libtiff again... Another problem is that IM can't embedd JPEG to TIFF in a lossl...
by Lars-Daniel
2016-10-02T15:25:17-07:00
Forum: Bugs
Topic: CMYK to sRGB: issue with profiles
Replies: 12
Views: 8770

Re: CMYK to sRGB: issue with profiles

In your command (2), try four variations, Guess what? When re-arranging the settings (-intent Relative, BPC) to different positions, I'm getting various results. That's somehow confusing :shock: with a different "-intent" before the first "-profile". Maybe try also with and without BPC. Actually, I...
by Lars-Daniel
2016-10-02T15:21:26-07:00
Forum: Bugs
Topic: JPEG: issue with sampling-factor
Replies: 10
Views: 11699

Re: JPEG: issue with sampling-factor

fmw42, thanks for your info about 2x1 instead of 4:2:2 ... both are still working, but I'll switch to 2x1.
I tried 1x1 with TIFF, but it's still 4:2:2 (2x1) :(
by Lars-Daniel
2016-10-02T14:55:26-07:00
Forum: Bugs
Topic: CMYK to sRGB: issue with profiles
Replies: 12
Views: 8770

Re: CMYK to sRGB: issue with profiles

You probably should post your repro.tif image so the developers can test with it. I can't ... it's under copyright. But I'll create a small extract. There you go: https://ufile.io/caa1 Your 1. is fine, but I do not think your 2. is proper. But guess someone knows which profile was used to create th...
by Lars-Daniel
2016-10-02T14:34:18-07:00
Forum: Bugs
Topic: CMYK to sRGB: issue with profiles
Replies: 12
Views: 8770

CMYK to sRGB: issue with profiles

Hi there. Version: ImageMagick 7.0.3-1 Q16 x64 2016-09-20 I've got some repro-images, which have been transformed to FOGRA39 (coated). For the web, I need to transfer them to sRGB. In directory ~/profiles/ there are "sRGB-IEC61966-2-1.icc" and "CoatedFOGRA39.icc". My commands: 1. magick repro.tif -i...
by Lars-Daniel
2016-10-02T13:59:39-07:00
Forum: Bugs
Topic: JPEG: issue with sampling-factor
Replies: 10
Views: 11699

JPEG: issue with sampling-factor

Hi there. Version: ImageMagick 7.0.3-1 Q16 x64 2016-09-20 What I'm trying to do: magick rose: -interlace Plane -define jpeg:dct-method=float -quality 95 -sampling-factor 4:2:2 422.jpg magick rose: -interlace Plane -define jpeg:dct-method=float -quality 95 -sampling-factor 4:4:4 444.jpg 1. identify -...
by Lars-Daniel
2016-08-24T16:34:43-07:00
Forum: Users
Topic: ppi get rounded
Replies: 10
Views: 9566

Re: ppi get rounded

magick wrote:We can reproduce the problem you posted and have a patch in ImageMagick 6.9.2-4 Beta, available by sometime tomorrow. Thanks.
ImageMagick v7.0.2-9 Q16 x64 2016-08-14 still has this problem :(
by Lars-Daniel
2015-10-01T15:35:29-07:00
Forum: Users
Topic: density based on size
Replies: 6
Views: 4579

Re: density based on size

See -resample at http://www.imagemagick.org/script/command-line-options.php#resample. That's the point: I do NOT want to resample it. Only density should change, image dimensions (pixels) shouldn't change. Let's say the image is 1000 x 1000 px and has 300 ppi by design; this would mean 84,67 x 84,6...
by Lars-Daniel
2015-10-01T06:33:11-07:00
Forum: Users
Topic: density based on size
Replies: 6
Views: 4579

Re: density based on size

It would be nice to let IM do the change of the density automatically based on printing size the user gives it it. This would help Windows users.
by Lars-Daniel
2015-09-29T17:53:38-07:00
Forum: Users
Topic: density based on size
Replies: 6
Views: 4579

density based on size

Hi there, is there a way to choose the resolution (ppi) based on the final size in millimeters? Right now, I'm using a script like this to get 550 x 550 mm output (the image is 4300 x 4300 px) : echo (4300*2.54/55) | tr -d $'\r' | bc -l = 198.58181818181818181818 convert -density 198.581818181818181...
by Lars-Daniel
2015-09-29T00:37:31-07:00
Forum: Users
Topic: ppi get rounded
Replies: 10
Views: 9566

Re: ppi get rounded

I've created a JPEG in Photoshop with resolution 12.3 x 12.3. Identify does recognize this correctly. But I think, EXIF is used to store the correct size.
Edit: EXIF with XResolution/YResolution is needed to make float work...
by Lars-Daniel
2015-09-29T00:32:31-07:00
Forum: Users
Topic: strip anything, BUT ...
Replies: 2
Views: 1984

Re: strip anything, BUT ...

I believe -thumbnail will strip everything except the profile on later versions of IM. You're right! Before IM v6.5.4-7 the "-thumbnail" would strip ALL profiles from the image, including the ICC color profiles. From this version onward the color profiles will be preserved. If the color profile is ...
by Lars-Daniel
2015-09-29T00:31:18-07:00
Forum: Users
Topic: ppi get rounded
Replies: 10
Views: 9566

Re: ppi get rounded

snibgo wrote:I don't know if this is an IM bug, or a limitation of JPG.
JFIF APP0 marker segment has 2 bytes for Xdensity/Ydensity density - is this important ?