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  1. Hi
    I have a question:
    How to make 10bit JPEG screenshot the same as in CorelDraw CMYK 32bit?
    How to make screenshot with a quality=100%? Some players have the opportunity, but then the bitrate is 250000 kb/s
    Are all JPEG images are always range PC?

    I have a commands FFmpeg:
    for %%f in ("%~dp1*.raw") do ffmpeg -y -f rawvideo -s 3840x2160 -pix_fmt yuv420p10le -r 25.000 -i %%f -f image2 -c:v mjpeg -frames:v 1 -q:v 2 -pix_fmt yuvj420p -colorspace bt709 -vf scale=in_range=pc: out_range=tv -ss 00:00:01.000 %%f.jpg
    I display the conversion parameters:
    [swscaler @ 0000000004ccc120] deprecated pixel format used, make sure you did set range correctly
    ...
    Stream #0:0(und): Video: mjpeg, yuvj420p(pc, bt709/unknown/unknown), 1920x1080, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default)

    Are implementations ffmpeg with files BPG?
    Last edited by Jamaika; 6th Jul 2015 at 00:32.
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  2. jpeg is lossy, and 10bit isn't supported for jpeg .

    Yes, jpeg is always PC range

    A better alternative using ffmpeg might be 16bit PNG . (A better alternative, at least quality wise, would be 32bit EXR, but ffmpeg can't write it, and common image viewers do not support it))
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  3. Originally Posted by poisondeathray View Post
    A better alternative using ffmpeg might be 16bit PNG.
    How to describe it with FFmpeg?
    Originally Posted by poisondeathray View Post
    (A better alternative, at least quality wise, would be 32bit EXR, but ffmpeg can't write it, and common image viewers do not support it))
    Do you know a free implementations?
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  4. -c:v png -pix_fmt rgb48le output.png

    16bit PNG's and TIFF are usually viewable in many normal image viewing applications


    Open EXR is basically the "standard" for high end effects work
    http://www.openexr.com/

    You can view them with djv, or xnview, but I don't think they can write EXR . I think imagemagick now supports some basic EXR writing, but probably not all functions . Blender can export EXR

    There is a free plugin for After Effects (but AE isn't free)
    http://www.fnordware.com/OpenEXR/
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  5. h.264 can be also used in 10 bit mode.
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  6. I Know. So I am surprised that there is no 10bit jpeg on FFmpeg. I'm not talking about JPEG2000, which is not very popular.
    http://www.digitaltrends.com/photography/new-jpeg-standard-complete-lossless-option/
    http://www.scantips.com/basics1d.html
    Last edited by Jamaika; 6th Jul 2015 at 06:45.
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  7. Originally Posted by Jamaika View Post
    I Know. So I am surprised that there is no 10bit jpeg on FFmpeg. I'm not talking about JPEG2000, which is not very popular.
    Maybe with: https://www.ffmpeg.org/general.html#OpenJPEG
    Not sure...

    Not - just check seem it is j2k.
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  8. I convert to j2k. And I had problems.
    for %%f in ("%~dp1*.mp4") do ffmpeg -y -i %%f -format jp2/j2k -c:v libopenjpeg -frames:v 1 -q:v 2 -pix_fmt yuv420p10le -colorspace bt709 -ss 00:00:01.000 %%f.jp2/j2k
    Firstly, as post such files on forums that could be seen.
    Secondly, what use photo view software. FFmpeg creates something, but programs do not really want it open. Eg. Honeyview, Windows 10, IE Spartan
    Last edited by Jamaika; 6th Jul 2015 at 08:50.
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  9. If you need to post on a webpage, then 8bit PNG is probably the most universally accepted and compatible option. PNG uses lossless compression. You can post a link to a higher quality/higher bitdepth version in the forum post
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  10. My experience:
    I use program DJV-convert. The program can and cool. I can import HEVC MP4/MKV. I can take a different screenshot, but I can't set command with EXR files. These files always have a gamma=2.2 and can't be changed. What bothers me, no record registry in the system Windows that I couldn't use a converter from anywhere on the disc.

    I use program ImageConverter Plus 9.0. I didn't know that files JPEG has so many possibilities. The problem is one, you can't import movies.
    Last edited by Jamaika; 6th Jul 2015 at 16:22.
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