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Questions tagged [image-processing]

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187 questions
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2 votes
1 answer
141 views

I'm trying to convert a JPEG to a TIFF using the following command: ffmpeg -i test.jpg -filter:v scale=in_range=full -pix_fmt rgba -color_range full test.tiff When I read the metadata of the JPEG ...
Ewen Crawford's user avatar
  • 31
2 votes
2 answers
1k views

I have a pretty simple command line to convert multiple images into other formats: for %f in (*.png*) do ffmpeg -i "%f" -c:v libjxl -distance 0.0 "%~nf.jxl" The problem is, now I'...
Chris Silva's user avatar
  • 23
4 votes
2 answers
349 views

I would like to crop all the images in a directory in place. This works to create a cropped copy of a file: magick slide.jpg -crop 1700x1100+0+550 slide-cropped.jpg I thought I would be able to make ...
Ellen Spertus's user avatar
  • 319
2 votes
1 answer
277 views

I have two images (of a schematic) and I want to highlight the differences on one of them: Using imagemagick I can create the visual diff and I can also overlay it over the second image: compare ...
Jounathaen's user avatar
  • 629
22 votes
6 answers
3k views

I use Linux, and sometimes I need to make a document printable when it was photographed in a very imperfect way. A page from a rather complicated example that I recently needed to handle is this one: ...
Mikhail Ramendik's user avatar
  • 529
0 votes
0 answers
192 views

I'm trying to use ffmpeg to reduce the size of GIF images by lowering fps and color palette size. This is the command I use: ffmpeg -i initial.gif -filter_complex "[0]fps=${fps},split[m][t];[t]...
xaxa's user avatar
  • 131
0 votes
1 answer
601 views

On my Debian 12, $ convert -list compress B44A B44 BZip DXT1 DXT3 DXT5 Fax Group4 JBIG1 JBIG2 JPEG2000 JPEG LosslessJPEG Lossless LZMA LZW None Piz Pxr24 RLE RunlengthEncoded WebP ZipS Zip Zstd Which ...
AlMa1r's user avatar
  • 1
0 votes
1 answer
89 views

Why do I not succeed into making this simple pdf → raster image → pdf round-trip file-size-stable? $ # Get original file (8KB, just extracted from my scanner). $ curl "https://nextcloud.mbb.cnrs....
iago-lito's user avatar
  • 396
0 votes
2 answers
2k views

Basically I want to extract all frames from the video where the images will be resized to be 720p. All of this I know how to do. But for testing I want to extract every Nth frame. So every 30th image ...
Joan Venge's user avatar
  • 1,564
1 vote
0 answers
132 views

What one does use to match objects such as images?
dusoft's user avatar
  • 181
2 votes
1 answer
24k views

I am following the "view page source" method for getting the full resolution of an Instagram image, but feel like I'm doing something wrong. Let's consider this example. If you view source ...
Display name's user avatar
  • 121
0 votes
0 answers
175 views

I have the below script to generate a video slider with FFmpeg You can see example here (first 10 seconds) : https://youtu.be/F_wf1uHqZRA I am trying to replicate effect of imgsli like a person is ...
Furkan Gözükara's user avatar
  • 841
2 votes
2 answers
786 views

I have some images (photos) and there are duplicates but no matter how I sort them they are scattered because of resolution and irregular naming. I tried gm compare but can't figure out which metric ...
yarns's user avatar
  • 145
0 votes
1 answer
812 views

I’m searching for a solution (in Linux console) which “inverts” an SVG. It shall take an input .svg and generate output .svg with multiple shapes, each one filling a single transparent area. And vice ...
Ivanov's user avatar
  • 1
1 vote
2 answers
104 views

Looking at the XPM (X PixMap) image format, I don't see anywhere that the number of bits per channel (or, equivalently, the number of possible colors) is specified. Poking around on my Ubuntu system, ...
Robert Dodier's user avatar
  • 161

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