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Questions tagged [image-processing]

The tag has no usage guidance.

1
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1answer
42 views

How can we get a git gui client that does proper image diff?

We're just starting a project (Unity based) and are using git (we've used SVN in the past) on Windows 10 and MacOS. We're currently using Sourcetree as our client, though we're open to use over ...
0
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1answer
65 views

How to use ffmpeg removelogo filter

I am trying to use ffmpeg removelogo filter, there is no syntax error but result has some kind of weird magenta triangle where mask is applied. I am using following command ffmpeg -y -i sample_image....
1
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0answers
19 views

Is it possible to render and/or recover half of an apparently damaged PNG file?

I have a chunk of a PNG file, missing its end. An unknown amount of data from the IDAT chunk is missing, as well as the IEND chunk. I've inspected the IHDR and it looks completely fine, correctly ...
0
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0answers
63 views

Splitting image of text into words - is it possible?

I am wondering if there is a way to split a scanned copy of a page (i.e. an image) into images of its constituent words. The book which is being scanned is in an Indian language for which OCR (Optical ...
0
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1answer
35 views

How to create an image using images with FFMPEG?

How to create an image using images with FFMPEG? Something like below? -f lavfi -i color=c=white:s=1080x1920 -loop 1 -i 1.png -loop 1 -i 2.png -filter_complex [0:v][1:v]overlay=shortest=1:x=0:y=0[v1];...
0
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1answer
15 views

Export all MATLAB images in one go

Code: https://pastebin.com/6MWsmaJF Essentially, I've created a function in Matlab which spits out around 200 images. How do I save all of these images in one go?
0
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0answers
38 views

Automatically generate slideshow with 1000 imag + text pairs

I want to create a slideshow video with background music automatically from a folder containing 1000 subfolders, in which there are 1 picture and 1 text file serving as the text on that picture slide. ...
0
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0answers
42 views

Two eps files merged into one with them side-by-side: How?

How can I combining two EPS files side-by-side on Linux? What is the command to use?
0
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0answers
41 views

Is there a way to make a pixel transparent based on its brightness level?

I would like to be able to make all pixels transparent that are in the bottom 50% of the brightness range. Let's call this image A, and say it is derived from a photo that is overexposed. I would ...
0
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0answers
34 views

Fix Extremely low exposure pictures/videos

I have got a shot of our successful performance, but we were shocked at how noisy and how low the exposure of the video is. It is hard for us to re-shot for some reason. So I plan to recover it, but ...
0
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1answer
21 views

Replacing colors in a logo to match site colors

I am working on trying to update the website for our organization. We are Tech Coordinators for school districts in Mississippi. I am not artistic, but I wanted to take a little time and try to change ...
0
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2answers
367 views

How to Batch Convert Filenames from Decimal to Hex Color Codes? [closed]

I asked this question first over on Graphic Design... Since then I was able to learn; and to utilize the fact that a program I was unfamiliar with (ImageMagick) has the capability to output RGB values ...
0
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1answer
32 views

Printing image on transparency without scrunching it

I have some transparencies which I bought from staples office store. They are meant for all different kinds of printers (they have a coating on one side). When I tried printing on them, I noticed ...
0
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0answers
19 views

How to stitch planar images? (pixel exact, no bluring, no deformation) [duplicate]

i have a sets of images A Each image (a_i) is a slice of an huge computer generated map-image M_A. Each image a_j in A overlaps with at least one other image a_k in A. There is no distortion, blur ...
1
vote
1answer
245 views

Is there a graphical way to get an RGBA value from a pixel in an image?

Is there a free way possible to open an image in a PC environment, click on the image, and obtain the RGBA value on the pixel that you clicked? I'm looking for a way to do this in a PC Windows ...
0
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1answer
87 views

Do gif image frames retain a timestamp?

I have a program that converts images into gifs. the Frames are created at certain times, (epoch) Im wondering if each frame retains the creation time, in a timestamp, perhaps in the header info of ...
1
vote
1answer
65 views

jpg file opens but 'On1 Resize app' fails to render anything on screen

I have installed On1 Perfect Resize 7 Trial (Standalone app) on my Windows 7 PC with 2 GB RAM. The recommended memory is 4GB for standalone version and 8 GB for Photoshop plug-in. This software claims ...
4
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2answers
5k views

How to crop an image using imagemagick from the command line?

I have a 640 x 640 image... I am trying to crop the image using imagemagick (https://www.imagemagick.org/script/command-line-options.php#shave) from the command line. I need to remove about 20 pixels ...
0
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1answer
229 views

Powershell script for processing pngs via exe parameters while maintaining source file structure

I'm currently working on a personal project where I need to resize tens of thousands of png files. I know little to nothing about scripting, PS or programming (I'm a graphic artist) I'm using a piece ...
0
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0answers
14 views

How To Instantly Save Screen To File With One Key [duplicate]

Using Windows 7, I would like to set up a single key, ideally a key which is not commonly used for anything else like PrintScrn, to automatically save the screen to a file. File name or location is ...
4
votes
3answers
780 views

How to achieve high-quality downscaling of diagrams (like in Firefox)?

I often need to downscale raster images consisting of thick straight lines and other thick curves, like this one: . Using GIMP 2.8.16 and its various interpolation options to resize the image to ...
0
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1answer
490 views

Why do I get a black box when I tile pictures with -filter_complex tile=2x1 in FFmpeg?

As I was trying to write a script (which attempts to join two pictures eventually) using FFmpeg I came across a very weird behaviour. This is a command from I've found in the How to join two images ...
0
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1answer
46 views

Images with blurring in the center

I was trying to remember the name of a specific effect/coding which is applied to images, where the center of image (or any part) is clear and gradually quality decreases in a circular manner. What is ...
1
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3answers
231 views

Transfer large amount of images (30GB) to virtual server from slow, old, linux machine?

I need to transfer 200,000 images to a windows EC2 instance from a really old linux machine. I don't have much experience with linux, so I haven't tried straight up FTPing because I don't think we ...
3
votes
1answer
248 views

When a PDF file only contains a scanned image, is it just a JPG image inside a PDF container?

Many scanners can scan a page into a PDF file. When this is done, is the PDF file really just a container that contains a single image? Is that image typically a JPG image, a PDF image, or a ...
1
vote
1answer
193 views

How to extract image rotation from a PDF

I'm extracting all the images from a bunch of scanned PDFs using pdfimages, in order to process and repackage them. The problem is that some images are rotated 90° (either CW or CCW) and others are ...
151
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13answers
25k views

How to prove the authenticity of a screenshot?

I have take some screenshots of chat from Whatsapp web using Windows 8 Snipping Tool. I saved those images in PNG format. Now I want to prove that those images are the original, not tampered or ...
0
votes
1answer
60 views

Auto-crop part inside variable sized box in images

I have a lot of scanned images in which I want to auto-crop the region inside the largest rectangle or box. This image shows some examples. The last one is what I would like the output to be like. ...
0
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0answers
41 views

How to make pictures not load blurrey at first

I noticed on many platforms (including Windows and Android) Firefox loads images blurry at first (especially when viewing google images). How can this be changed? I'd prefer nothing to be loaded at ...
5
votes
3answers
26k views

GIMP save PNG in 16 and 24 bit

I have a .png image which I need to save in 24 and 16bit using gimp. I went to Image -> Mode -> Indexed, but maximum value is 256 colors. I tried to paste in 16777216 colors for 24bit, but it did ...
3
votes
3answers
679 views

Can't open recovered image files

My portable 2.5 hard drive just stopped being recognized by Windows. It was still visible as RAW, so I used a recovery software. It recovered a lot of files (I had a lot of pictures on it), but I can'...
1
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1answer
144 views

Generate images from large list of words

This is a bit of an odd question, but basically I'm trying to create a set of Pictionary cards for a game. To do this, I have a list of 1500 nouns separated by newlines and I need each of them to be ...
23
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2answers
31k views

Is there a generic mime-type for all image files?

I know that I can use the specific mime-types as listed for example here, or a generic mime-type for any file like application/octet-stream, but is there a generic mime-type for all image files? (I ...
-1
votes
1answer
63 views

How can an image of a scanned page be automatically divided into words similar to reCaptcha?

I have an image of a page from a book and I want to divide it into separate little cropped words. Is there a way to do that?
1
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0answers
144 views

avconv / ffmpeg covert images to video skips frames when frame type changes

I have an instance of ffmpeg that captures one fps from our home CCTV cameras. At the end of the day I have an ffmpeg script that takes those images and turns them into a video. This is fine with one ...
1
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0answers
39 views

Looking for a program that can monitor and downscale images

I have a Windows 2012 webserver to which users upload images, and at that point i dont have any control over file size or images size. But, sometimes they do upload way too big images. These images ...
0
votes
1answer
265 views

Removing background from image with transparent foreground

I have an image which has a constant color background.  There are objects drawn in front which may have transparency. Is there a way, algorithm-wise, to remove the background from the image so that I ...
8
votes
2answers
916 views

Generate hundreds of resolutions from a single image

I'm working on a project where I need a single image in multiple resolutions. Lucky enough the image is identical width/height resolution and would work well with all resolutions with the same height ...
-1
votes
1answer
52 views

Scale this image for printing A3 or bigger without source codes

You can choose whatever software for presenting ECG signal. I did the image by Matlab 2015a in Ubuntu 10.10.3/Debian 8.1. However, assume that you do not have here the original signal. You need to ...
0
votes
1answer
423 views

Downloading images via wget

When downloading an image with wget using wget link I get the following errors: HTTP request sent, awaiting response... 302 Moved Temporarily Location: [following] --2015-05-24 14:47:46-- http://...
0
votes
1answer
27 views

Substracting colors and extracting transparency values

Lets say a picture was made to semi-transparent and added on a flat background color. The original picture, background color and result(mixture) is known. But, that added transparency(alpha value) is ...
5
votes
3answers
3k views

Does the JPEG file format support RGB data?

I am doing some programming that involves encoding image data using WIC. I used RGB data but WIC always treats it as BGR. I have a related question on Stack Overflow dealing with the programming ...
1
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0answers
34 views

How does one recover a large image, given several crops of it with sufficient overlap? [closed]

Suppose you have several small images, all cropped from a single large image. Each small image is some subrectangle of the large image. The small images have sufficient overlap with each other. ...
0
votes
0answers
75 views

How to display a fragment of an image file using Scalpel

I am working on a demonstration using Scalpel and its abilities to carve out image files. I took a small thumb drive and filled it with many small sized files until it was full. I then went and ...
0
votes
2answers
169 views

Image sequence handling in ffmpeg

I need to convert an image folder with unnumbered names, like: 11.49.18.204.jpg 11.49.28.205.jpg 11.49.38.220.jpg 11.49.48.220.jpg 11.49.58.235.jpg 11.50.08.250.jpg FFMPEG only accepts numbered ...
0
votes
1answer
257 views

What do I look at when I view a JPG image in a text editor? [duplicate]

I am not knowledgeable of Image file formats or even compression. I opened up a JPG image file in a text editor and I saw gibberish. Not zero and one gibberish. Or even numbers from 0 to 256 gibberish....
1
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2answers
239 views

Deduplicate images synced across devices in various resolutions

I currently have a couple of scripts and Android apps that together do the following for a set of member devices (smartphones, PCs, digital cameras): all pictures taken by all member devices are ...
0
votes
1answer
84 views

Why this scanned book image has no background?

If you save this image on your desktop, you see it's background color as your desktop color. If you open it with Adobe Photoshop, its background id checkered which means it has no background. It's ...
1
vote
1answer
1k views

video size reduction by grayscaling it

When we convert a video into grayscale, all of its 3 colors (RGB) in a pixel are assigned the same number (instead of 3 different numbers). So theoretically we must have reduction in size almost by 66%...
1
vote
1answer
1k views

reducing the size of PDF file of scanned images

I downloaded this PDF file from a website which is 350 KB in size with 20 pages. All pages are scanned images. I extracted the images using Adobe Acrobat Pro which are 1.32 MB in size collectively (...