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by fmw42
2017-11-13T14:04:51-07:00
Forum: Users
Topic: input Linear RGB specifiy output RGB or sRGB
Replies: 32
Views: 1249

Re: input Linear RGB specifiy output RGB or sRGB

See further updates in my example above.
by fmw42
2017-11-13T13:41:56-07:00
Forum: Users
Topic: input Linear RGB specifiy output RGB or sRGB
Replies: 32
Views: 1249

Re: input Linear RGB specifiy output RGB or sRGB

See my example above that shows that IM 6.9.9.10 and beyond are not creating linear output when using -separate and -combine.
by fmw42
2017-11-13T13:30:51-07:00
Forum: Users
Topic: input Linear RGB specifiy output RGB or sRGB
Replies: 32
Views: 1249

Re: input Linear RGB specifiy output RGB or sRGB

Here is a simple test that shows that IM 6.9.7.4 is processing correctly and IM 6.9.9.23 is not. Processing directly and again with -separate and -combine, shows a difference for IM 6.9.9.23, but properly the same for IM 6.9.7.4 im6974 convert logo: -colorspace RGB logo_linear1_6974.png http://www....
by fmw42
2017-11-13T12:50:30-07:00
Forum: Users
Topic: input Linear RGB specifiy output RGB or sRGB
Replies: 32
Views: 1249

Re: input Linear RGB specifiy output RGB or sRGB

I checked the following in IM 6.9.7.4 and it behaves correctly -- the same as above with 6.9.9.23. convert logo: logo.tif convert logo: -set colorspace RGB logo1.tif convert logo: -colorspace RGB logo2.tif Only logo2.tif is linear and darker than the other two. However, I do see a slight different w...
by fmw42
2017-11-13T12:49:04-07:00
Forum: Users
Topic: PDF to TIFF Multipage, aliasing issue.
Replies: 9
Views: 194

Re: PDF to TIFF Multipage, aliasing issue.

Please post your original PDF file so we can examine it.
by fmw42
2017-11-13T11:46:12-07:00
Forum: Users
Topic: input Linear RGB specifiy output RGB or sRGB
Replies: 32
Views: 1249

Re: input Linear RGB specifiy output RGB or sRGB

Try this: convert logo: logo.tif convert logo: -set colorspace RGB logo1.tif convert logo: -colorspace RGB logo2.tif logo.tif will be non-linear. logo1.tif will be non-linear. logo2.tif will be the only one that is linear. You can tell because the linear one will be darker. You have to change the pi...
by fmw42
2017-11-13T11:34:58-07:00
Forum: Users
Topic: compare with "-lowlight-color transparent" shows up as black
Replies: 4
Views: 111

Re: compare with "-lowlight-color transparent" shows up as black

I can confirm that this has changed somewhere between IM 6.9.4.0 and 6.9.5.8 Mac OSX Sierra. It does not show transparency for the current IM 6.9.9.23 or IM 7.0.7.11. Sorry I do not have current access to versions in-between those. Using Anthony's images from http://www.imagemagick.org/Usage/compare...
by fmw42
2017-11-12T22:38:37-07:00
Forum: Users
Topic: input Linear RGB specifiy output RGB or sRGB
Replies: 32
Views: 1249

Re: input Linear RGB specifiy output RGB or sRGB

This does not make a linear input. It keeps the same colorspace, but tries to set the gamma=1, which will only work if the image type supports keeping the gamma in its meta data convert logo: -set colorspace RGB ... You need to do the following to convert pixel data to linear. convert logo: -colorsp...
by fmw42
2017-11-12T19:28:30-07:00
Forum: Users
Topic: input Linear RGB specifiy output RGB or sRGB
Replies: 32
Views: 1249

Re: input Linear RGB specifiy output RGB or sRGB

Is your myimage.png linear or non-linear. You have to tell IM what the colorspace is before separating and before combining. I tried to fix the page, but only had Magick change it in one paragraph. It needs to be rewritten. I have not had time nor will I for about a week. You can remind me next week...
by fmw42
2017-11-11T19:14:36-07:00
Forum: Users
Topic: No consistent effect across different resolutions
Replies: 12
Views: 326

Re: No consistent effect across different resolutions

Sorry, one of the dithering experts will have to help you at this point.
by fmw42
2017-11-11T18:17:18-07:00
Forum: Users
Topic: No consistent effect across different resolutions
Replies: 12
Views: 326

Re: No consistent effect across different resolutions

You have not installed IM 7 correctly, I guess. I do not use Windows, but did you check the legacy install when you installed IM 7. You have some kind of install window do you not? Perhaps you renamed convert.exe to convert in IM 6. Note one Windows there is a Windows convert.exe also. What happened...
by fmw42
2017-11-11T17:27:07-07:00
Forum: Users
Topic: No consistent effect across different resolutions
Replies: 12
Views: 326

Re: No consistent effect across different resolutions

Since your 1080 image is larger than your 540 by about 2 in height, have you tried <threshold map="hlines4x2a"> <description>Horizontal Lines 4x2 (bounds adjusted)</description> <levels width="4" height="2" divisor="10"> 3 3 3 3 9 9 9 9 </levels> </threshold> Sorry, I know little about dithering and...
by fmw42
2017-11-11T17:23:22-07:00
Forum: Users
Topic: No consistent effect across different resolutions
Replies: 12
Views: 326

Re: No consistent effect across different resolutions

With IM 7, you should change convert to magick.

Code: Select all

magick  in.png -remap colors.png -posterize 2 -ordered-dither hlines2x2a,0.9  out.png
by fmw42
2017-11-11T17:22:21-07:00
Forum: Users
Topic: No consistent effect across different resolutions
Replies: 12
Views: 326

Re: No consistent effect across different resolutions

Why does your color pallet have two parts? Is that intended?
by fmw42
2017-11-11T17:11:21-07:00
Forum: Users
Topic: No consistent effect across different resolutions
Replies: 12
Views: 326

Re: No consistent effect across different resolutions

I am not an expert on dithering. But I believe it will be scale dependent. Perhaps you need to create a larger dither pattern. Perhaps someone who knows more about dithering than I will be able to help further. It would be useful if you post your original images separately at full resolution, so oth...