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Questions tagged [image-manipulation]

34 questions
36
votes
8 answers

Square thumbnails with ImageMagick (convert)?

How to create square/cropped thumbnail using ImageMagick ? Cropping like below.
marioosh
  • 3,651
33
votes
4 answers

How to copy a selection from one image to another image in GIMP?

Recently I switched from Photoshop to GIMP. I want to copy a selection from one image to another, so that I can fill that selection with color in another image and I can get the shape without recreating it manually. In Photoshop we can copy the…
raj
  • 581
14
votes
2 answers

Combine multiple images to form a strip of images ffmpeg

I wish to combine multiple images into a single strip of images, using FFMPEG. I have been trying to search this thing on google, but unable to find anything useful. All links take me to places where multiple images are combined to give a video…
Manu
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12
votes
1 answer

Can I move layers one pixel at a time (using arrow keys for example) in GIMP?

Downloaded GIMP yesterday and been working with it for 6hrs or so. I am positioning many different layers in a way that makes them interact properly. By properly, I mean subject to my aesthetic tastes, so I often need to shift things to the right a…
OldSchool
  • 331
9
votes
4 answers

Creating and splitting large multipage TIFF images

I need to both create and split multipage TIFF images, ranging from 2 to almost 100 pages (A4, 300 dpi, 2500×3500 px). The job is performed periodically by a script on an x64 Linux server. Currently I'm using Imagemagick. The smaller cases do not…
Karol S
  • 248
7
votes
3 answers

Resizing and cropping images to 6x4 to width of 1024

I have a mixed set of images, each one having a slightly different resolution with a slightly different aspect ratio from the other images. I have tried using commands like: convert -resize and: convert -crop However I can't seem to figure out the…
oshirowanen
  • 1,776
7
votes
3 answers

mogrify - how do you recurse through subfolders in Windows

I thought there was a simple switch in mogrify command options that tells it go through subfolders as well. I didn't find any. On Linux, the "find" command seems to do the trick, how do you do this on Windows? magick mogrify -resample 72 -resize…
Regmi
  • 855
6
votes
3 answers

Trimming exterior empty space with ImageMagick does not work on scanned documents

Given an image that has some actual content inside and usually some unwanted white or black or transparency around that, I would like to trim or crop the exterior parts using ImageMagick. The following image has been drawn digitally on a computer…
caw
  • 218
5
votes
2 answers

How to ensure the authenticity of a picture?

Many times I face images on the Internet or spread on social networks like Facebook and twitter. How to check that those images are right I mean not processed in photoshop? Firstly I check that those images are related to the specific event by…
Anyname Donotcare
  • 651
5
votes
4 answers

Is there a tool that allows me to edit a picture so that it has an exact file size?

For various reasons I want to scale down a couple of images so that they have a specific file size. I want to convert gif, tiff and jpeg files. Is there any tool that allows me to do that with a batch?
RoflcoptrException
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5
votes
2 answers

Resampling embedded raster images in SVG

I have a batch of SVG files with embedded, high-res PNG images. The PNG files have been resized considerably smaller (via transform, matrix, etc). What is the best way to resample these embedded images in place? The goal is to get smaller,…
zourtney
  • 903
4
votes
2 answers

Despeckle line art

We have a number of line-art charts unfortunately saved as JPEGs. They are now riddled with distracting compression artifacts or "speckles". Is there any way of removing these? I do not have the original files and it will be very difficult to…
Dour High Arch
  • 1,066
3
votes
1 answer

GraphicsMagick error reading PNG file

When trying to read a large PNG file, GraphicsMagick command gm convert pallaso1.png pallars-sobira.jpg just displays this error c:\progs\GraphicsMagick\gm convert: Read Exception (PALLASO1.PNG). I have the latest GM version, GraphicsMagick…
PA.
  • 726
3
votes
1 answer

Best ImageMagick parameters to upscale image containing text

What are the best ImageMagick parameters to upscale an image that contains text in Latin alphabet? Take this image as example: I did some experimenting, for example: magick convert in.png -filter lanczos -resize 400% -unsharp 0x1 out.png But in the…
robertspierre
  • 750
2
votes
1 answer

How to combine multiple similar images with "holes" into one good one?

Suppose you have multiple photos of the same object (from slightly different angles), each have some obstacles in foreground. You added an alpha channel to each picture and "erased" the obstacle (leaving "holes" in each picture). You want to…
Vi.
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