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I haven't found any
Do 48bit images have higher quality than 24bit ones?
What type of video ? 8bit420 YUV ?
Then 16bit per channel RGB is technically lossy too
What is the usage case ? Why are you using PDF? Why specify the DPI ? -
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Probably some lossy 10bit420 anime re-encode of a 8bt420 BD , right ?
Technically 8 or 16 bit RGB is lossy for anything YUV, because you can never get back the original YUV values from 8 or 16 bit RGB . Some values are clipped and cannot be represented in integer RGB color model
Most people don't worry it, because most people are viewing on an 8bit RGB display - you're not going to see the differnce -
The YUV video is converted to RGB for display. When you view something on a TV or monitor, it is an RGB representation of that YUV data
(You might worry about it if this was an intermediate step)
So a 24bit (or 8bit, since 8 x 3 is 24) image has higher quality, then?
Can ImageMagick and/or Acrobat losslessly make 8 (or 24) bit pdf files out of png files without losing any quality?
But why do you want PDF in the first place ? -
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That was when you thought imagemagick was making 16bit PDF compared to 16bit PNG, when in fact it was 8bit PDF compared to 16bit PNG
PDF shouldn't be smaller, it should be larger for 8bit RGB
jpeg-xl would be a good choice for small lossless image filesizes
For true lossless for YUV video, AVIF supports YUV images and has high compressionLast edited by poisondeathray; 1st Feb 2024 at 17:49.
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No YUV support for jpeg-xl , but you that didn't worry you earlier with PNG's
AVIF, HEIC/HEIF supports YUV
What animated file formats support YUV (gifs, apngs, or something else)?
GIF has 256 colors, very lossy
APNG is RGB only
Why do you need an image format ? You get better compression with video formats, because of temporal compression. If you want smaller sizes , use video. -
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Again why not video? I can understand single image - but if the usage case is image sequence, why not video instead - the filesize will be smaller
What is the intended usage case ? Do you care about compatibility ?
And you should start a new thread as AVIF or HEIF have nothing to do with PDF . -
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OK use video - problem solved!!!
On average, temporal compression using the same pixel format and comparable compression method you would have used for still image will save about 10-40%.
8bit RGB PNG to PDF in acrobat => PDF back to 8bit RGB PNG in acrobat is lossless if you setup the Convert To PDF options as lossless JPEG2000. Defaults are jpeg medium quality
For 8bit RGB - compared to even highest PNG compression , JPEG2000 lossless used in PDF will generally be better in terms of compression ratio, because it's newer. And JPEG-XL (but not available in PDF, or at least not yet) even better than JPEG2000, because it's even newer -
So use JPEG2000 because it's smaller and the results will always be lossless in Acrobat, even if I extract the images from the pdf as png files? Still how do I make sure I get 96dpi (like my input images) from my pdf file, and extract them as 8bit using other tools?
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JPEG2000 supports lossy too - you need to choose the lossless option explicitly .
Still how do I make sure I get 96dpi (like my input images) from my pdf file, and extract them as 8bit using other tools?
Acrobat can save as PNG. And I verified the steps in the post above was lossless -
8bit RGB 1920x1080 anime source "00214.png" from this thread
https://forum.videohelp.com/threads/413078-VirtualDub2-Lossless-jpgs
1920x1080 8bitRGB anime png
2,211,480 bytes
PNGCrush
2,088,341 bytes
PNGGauntlet
2,019,688 bytes
Acrobat PDF (jpeg2000 lossless)
1,709,341 bytes
Adobe jpeg2000 lossless
1,677,374 bytes
Webp lossless
1,616,644 bytes
JPEG-XL lossless effort7
1,325,014 bytes
JPEG-XL lossless effort9
1,292,448 bytes
So as you can see PDF has zero (actually negative) benefit over the same jpeg2000 if you're trying to save space - It's because the PDF container adds overhead
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