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Questions tagged [image-manipulation]

31 questions
36
votes
8 answers

Square thumbnails with ImageMagick (convert)?

How to create square/cropped thumbnail using ImageMagick ? Cropping like below.
marioosh
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29
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3 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
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12
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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
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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
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7
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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
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7
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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
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5
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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
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5
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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
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4
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
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4
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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
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3
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3 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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3
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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.
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2
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3 answers

Delete and shift pixels with PAINT.NET or other tool

How can I delete and shift pixels with PAINT.NET ? That is if I delete an entire vertical or horizontal slice of the image, how can I just have the remainder slide over and the image size automatically sized to what's left over? If not with…
Matt
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2
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2 answers

Is there a Free Photoshop plugin/software which auto removes backgrounds?

I'm looking for a background removal plug-in or software that automates or at least eases the process of removing backgrounds from pictures / digital photos. I have seen a few like Mask Pro 4, Snap and BackGround Remover all these are paid…
rzlines
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1 answer

Turn 3D rotation of vector object into vector object

I have a vector object in Illustrator CS3. For the sake of simplicity, let's say it's a rectangle. It has been "3D-rotated", and now appears to me to be a slightly skewed parallelogram. Of course, this 3d effect could be discarded at any time and it…
Tim Chaves
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