Search found 50 matches
- 2017-11-13T13:38:27-07:00
- Forum: Users
- Topic: input Linear RGB specifiy output RGB or sRGB
- Replies: 36
- Views: 28179
Re: input Linear RGB specifiy output RGB or sRGB
but which one has the bug? ... I suggest you reduce the commands to the minimum that shows the difference between versions. For example, I suspect the lines with "-poly" have no significance. When you have "-channel" in a command, you should always have a "+channel" af...
- 2017-11-13T12:52:18-07:00
- Forum: Users
- Topic: input Linear RGB specifiy output RGB or sRGB
- Replies: 36
- Views: 28179
Re: input Linear RGB specifiy output RGB or sRGB
Start simple. Then when you understand that, then add your other clone processing. Which is how I discovered the bug. Tiff does not support RGB colorspace nor gamma=1 My point exactly, pick any tiff file you like, and then process it, with 6.9.7-4, 6.9.9-20 or 6.9.9-23, you would expect the same re...
- 2017-11-13T08:29:06-07:00
- Forum: Users
- Topic: input Linear RGB specifiy output RGB or sRGB
- Replies: 36
- Views: 28179
Re: input Linear RGB specifiy output RGB or sRGB
Just following up, as there is indeed a bug somewhere. 6.9.7-4 gives a different result than 6.9.9-20, 6.9.9-24 with the use of: convert logo.tif -strip -set colorspace RGB \ -fx "u?u:1" \ -separate \ \( -clone 0 -poly ".1,-1" -poly "1,1.65" \) -swap 0,3 -delete 3 \ \( ...
- 2017-11-13T06:02:30-07:00
- Forum: Users
- Topic: input Linear RGB specifiy output RGB or sRGB
- Replies: 36
- Views: 28179
Re: input Linear RGB specifiy output RGB or sRGB
Thanks fred, but I don't think my post got the point across, and I am still confused what the rules are, or in fact if there is a bug somewhere... 6.9.7-4 The first part of my example probably caused confusion, so lets start with a tif file which I want to consider as linear. My understanding is the...
- 2017-11-12T20:49:23-07:00
- Forum: Users
- Topic: input Linear RGB specifiy output RGB or sRGB
- Replies: 36
- Views: 28179
Re: input Linear RGB specifiy output RGB or sRGB
In my case my input file is linear, and I want to stay that way! convert logo: -strip -set colorspace RGB \ -separate \ \( -clone 0 -poly ".1,-1" -poly "1,1.65" \) -swap 0,3 -delete 3 \ \( -clone 1 -poly ".1,-1" -poly "1,1.65" \) -swap 1,3 -delete 3 \ \( -clon...
- 2017-11-12T18:41:06-07:00
- Forum: Users
- Topic: input Linear RGB specifiy output RGB or sRGB
- Replies: 36
- Views: 28179
Re: input Linear RGB specifiy output RGB or sRGB
Both these pages https://imagemagick.org/script/color-management.php and https://legacy.imagemagick.org/script/color-management.php the legacy and the current still have examples that are WRONG! convert myimage.png -separate myimage_channels_%d.png convert myimage_channels_*.png -combine myimage2.pn...
- 2017-10-31T05:22:18-07:00
- Forum: Digital Image Processing
- Topic: Perform histogram analysis on certain image area only
- Replies: 12
- Views: 95688
Re: Perform histogram analysis on certain image area only
I see you have 6.8.9.9, but the patch date says 2017-07-31. That means it has been patched (though not to the current level/date). But I suspect it has botched patches for connected components. 6.8.9.9 per se is about 120 versions old. The first official debugged release was 6.8.9.10. I will take a...
- 2017-10-30T16:50:49-07:00
- Forum: Users
- Topic: Finding vertical stipes to use for crop input
- Replies: 5
- Views: 3925
Re: Finding vertical stipes to use for crop input
I can get it close, but there may be false positives that you will have to filter by looking at the regularity of the gaps. Ok that's absolutely amazing, or should I say absolutely magic! The false positives should not a problem, to filter out as I can filter those out against the known aspect rati...
- 2017-10-30T16:06:14-07:00
- Forum: Users
- Topic: Finding vertical stipes to use for crop input
- Replies: 5
- Views: 3925
Re: Finding vertical stripes to use for crop input
No the problem is more specific, hence I thought it best to start a new topic.
- 2017-10-30T15:47:44-07:00
- Forum: Users
- Topic: Finding vertical stipes to use for crop input
- Replies: 5
- Views: 3925
Finding vertical stipes to use for crop input
I have images of films strips from a scanner, like the following example. These, that have been nicely trimmed. https://ibb.co/dWDTbR I want to find the horizontal coordinates of the separating strips, i.e. the continues grey areas separating each frame. I want to use the horizontal coordinates to d...
- 2017-10-27T10:52:10-07:00
- Forum: Digital Image Processing
- Topic: Colorspace When to convert?
- Replies: 6
- Views: 71689
Re: Colorspace When to convert?
Thanks,
Am I correct in my understanding that converting wider gammut colorspace like ProPhoto --> sRGB is losefull?
i.e. Profoto --> sRGB --> Profoto will result in some clipping if the original colours are "wider" than what can be translated into sRGB space.
Am I correct in my understanding that converting wider gammut colorspace like ProPhoto --> sRGB is losefull?
i.e. Profoto --> sRGB --> Profoto will result in some clipping if the original colours are "wider" than what can be translated into sRGB space.
- 2017-10-27T06:40:42-07:00
- Forum: Developers
- Topic: 6.9.9-20 and 7.0.7-8 tags
- Replies: 2
- Views: 11818
Re: 6.9.9-20 and 7.0.7-8 tags
thanks I grab those now.
- 2017-10-26T13:39:06-07:00
- Forum: Digital Image Processing
- Topic: Colorspace When to convert?
- Replies: 6
- Views: 71689
- 2017-10-26T10:08:29-07:00
- Forum: Digital Image Processing
- Topic: Colorspace When to convert?
- Replies: 6
- Views: 71689
Colorspace When to convert?
I am struggling with a few concepts around colorspace, and profiles etc. I have implemented a transformations that relies on a linear RGB input. (An inversion of a negative film scan) The output from this transformation is to be further processed by other tools, ideally Rawtherapee. Rawtherapee inte...
- 2017-10-23T06:29:17-07:00
- Forum: Users
- Topic: input Linear RGB specifiy output RGB or sRGB
- Replies: 36
- Views: 28179
Re: input Linear RGB specifiy output RGB or sRGB
I will report the issue. It should read: Normally, the conversion to separate each channel of an sRGB color image produces separate non-linear grayscale images. However the same concept can be applied, if it is desired to keep the separate channels as linear grayscale. For example, the following pr...