Questions tagged [image-processing]

programs that manipulate, enhance, or convert images

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Tool to detect (and delete) empty images?

I've exported a tile layer from qGis using QMetaTiles plugin. It outputs a folder that contains a lot of images (the tiles). But most of those images are blank (full transparency, no visual data); and ...
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Are there any ways to convert image files (jpg,png) to WebP programmatically in Android?

I am developing a social media app in Android Studio with Java and I need ways to convert some images to WebP to reduce size of posts. Do you have any suggestions? I have tried in the past to use APIs ...
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Software package for Spatial-Spectral Image Fusion

I am involved in a remote sensing monitoring process for smallholder crops. I am using Sentinel-2 imagery (10m and 20m resolution) and also airborne imagery with 4 spectral bands and 1m resolution (B, ...
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2D vector graphics library to facilitate 2D inverse kinematics

I have looked at many SVG drawing libraries but have not seen any that support or even make implementing 2D IK reasonably efficient. I was excited to find the Godot engine since it has all the support ...
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How to make a small APNG from a sequence of PNG images?

How to make an animated png with a minimal size (quality loss is acceptable, use of a global palette is too) from a sequence of PNG images?
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Any apps/sites to vectorize images for free?

I drew some diagrams in a mobile Android sketch app and submitted them to a publisher, but he says the image resolution is poor and he wants vector versions. Freelancers charge hefty prices. I found ...
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Can any libraries extract picture(s), if any, from an image of a page of text

I have jpeg images of pages of text, some of which have pictures within their layout. I don't care about OCR of the text, but I would like to be able to extract the pictures from the page image for ...
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3 votes
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Linux command to add text to huge image (fast)

I have lots (100s) of 12208 × 6867px jpg images and would like to add a box and text on the bottom left of each image. I'd like a white box around text with x padding, and ideally a single rounded ...
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Any reliable raster library in C?

I'd like a minimal library that'll allow me to read/write/manipulate raster image formats, like BMP and PNG. Written in C99 or C11 or otherwise portable. Any recommendations? Edit I need to: load bmp ...
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How can I overlay numbers of RGB of an image on the image itself by using software?

any available software or libraries to help me do this automatically? The result will be like a RGBmap overlaid on the image itself. I mean to display all the pixels with their own numbers(values) of ...
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Software to bulk/batch convert thousands of PNG image files to JPG without changing timestamps (Windows)

I'm looking for gratis Windows software to bulk/batch convert thousands of PNG image files to JPG. The big requirement is that both the created and modified timestamps of the files must be maintained....
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App to remove duplicate frames through out the gif to make a perfect loop

So I have been using this application called Screen to Gif to make gif of my favourite game scenes but the issue is human error, for example, I tried making a gif of a scene that goes on repeat and ...
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2 votes
1 answer
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How to view many succeeding pictures from a website?

Let's say, an website contains succeeding pictures, but there is no (online) album on that website, to find the pictures. For example: You know that www.site.com/kjhrr/rjekj/23323.jpg and www.site.com/...
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GPU-accelerated command line image resize app that supports Nvidia GPUs?

I am looking for something that ticks the following boxes: Can resize images to a maximum dimension while preserving aspect ratio Has a command-line interface or other support for scheduled batch ...
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Batch HEIC to JPG with metadata (EXIF) offline and preferably OpenSource

I'm looking for offline (OpenSource) SW with GUI which is capable to batch convert HEIC from Apple devices to JPG with good (and adjustable) quality and keep all possible metadata in EXIF. I tried (...
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Open source (BSD compatible) "generic" CMYK ICC profile

I'm looking for an OSS/Free "generic" CMYK ICC profile that I can include and distribute with my BSD licensed project. The profile should ideally match the characteristics of Generic CMYK ...
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Python library to estimate periodicity of motion in an image

I have a video clip in which a surface undulates with a steady period - I need to be able to use image processing to count the frequency and do it repeatably in an automated fashion when other clips ...
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3 votes
1 answer
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trace PNG with outlines to SVG

I have a PNG file that contains some B/W lines, e.g., I would now like to trace those lines to get an SVG file. When using Inkscape to trace, it'll always return the lines as 2D plastic objects: I ...
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Node library to check the the user uploaded file is an actual safe image

I would like to verify that the image a user has uploaded is an actual displayable image without any crazy scripts, not just some random file or a corrupted image. How can I do this? I've looked at ...
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3 votes
0 answers
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Sorting images (so they are viewable in windows' file explorer) by content similarity

I've been able to find a lot of similar questions, most on photos stackexchange, but I couldn't find any satisfactory answers. What I AM looking for: Sort/Rename images based on the similarity of the ...
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Good thumbnails index generator with file names?

Given a folder full of pictures, what would be a good program to generate a thumbnail index file for them? Basically I want to generate a single picture containing thumbnails of everything inside the ...
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Auto fill gaps in lines in an image

In the image below, I want a gratis Windows app to close off the gaps - in red (or anything except black). Should become something like although my lines are not perfect :-) Also, it is somewhat ...
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Is there a way to apply shaders to camera on system level?

I just came across this fancy CRT shader which can be used with a camera input and I was wondering, is there a way to use such effects so that any app using camera will instead see the processed image?...
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Looking for a library to detect text areas in an image (not OCR!)

My client has an issue with screenshots which are included in their handbooks. For legal reasons, they want to blur out text areas in the images. The screenshots are of a machine operator interface. ...
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Image tracking without AR/ 3d in JavaScript

We have a big mural on a big wall. It is requested that when viewing this mural on your handheld device, like a smartphone's camera, image overlays should be placed at specific positions within that ...
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Image background remover API

Can anybody recommend a good, reasonable priced (preferably free) image back ground remover API? Can either work with Node JS or .NET. I've looked at a number of them EG. removal.ai, but they all seem ...
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1 vote
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Is there a photogrammetry software suite capable of applying the same operation on a different set of 2D images?

Is there a photogrammetry software suite capable of applying the same operation on a different set of 2D images? Let me clarify it with an example. There are a lot of photogrammetry applications which ...
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1 vote
1 answer
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Scanner app like tool in macOS

There are many scanner apps for smartphones like Microsoft Lens, Scanner Pro, Adobe Scan, etc. They usually apply some filters to make documents clean and some rotate/straighten tools to fix skewness. ...
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Tool to automatically fill defined polygons on an image

I would like to ask if there is an automatic graphic tool to fill polygons on an image? My problem concerns in particular that each polygon of one type should have the same color. I would like to ...
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3 votes
1 answer
27 views

Reproducing photos with vector-based geometric primitives (ellipses, bezier curves)

Anyone knows a free software or a filter/plugin/extension for image processing software that works like primitive.lol does?. It turns pictures into a stack of ellipses, rectangles,triangles (= a Cargo ...
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1 vote
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realtime Blur, Zoom, Pan with images on Android

I am trying to find a class or library to do realtime Blur, Zoom, Pan with images on Android. I looked at the EffectFactory class but it's not covering these things
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1 vote
1 answer
100 views

Can I easily extract handwriting from a recipe card to an image?

My mom wants to save/digitize a lot of our grandma's old recipes, but she also wants to preserve the original handwriting (not just convert to text). I can find a lot of suggestions for software that ...
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2 answers
50 views

Paint.net Alternative for macOS

When I used windows, I used paint.net and loved it. I used it all the time. I switched to a Mac and was disappointed when I found out there is no paint.net for Mac. Has anyone found any good ...
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OCR software/application that transforms hand-written code to digitally-written code

What I am looking for is a software/application that takes a source code written by hand on a piece of paper and converts it to digital code in a clean, tidy, and orderly fashion. I do not want just ...
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1 vote
0 answers
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Combine multiple screenshots into one

I'd like to take lots of overlaping screenshots to capture parts of a "top-view" ancient game, and to assemble them into one big image, revealing the map during my progress. Which software ...
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1 vote
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Looking for easy to use free image data annotation tool online

I am looking for an easy to use free image data annotation tool online for computer vision-related task (deep learning). Any kind of suggestion would be really great. Background: I will use at most ...
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Creating collages with smooth transition between images

I have created collages with Microsoft Autocollage before and I like the style of it. It's not like other collages where we can still identify single images by their border. Instead, the images blend ...
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1 vote
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TinyPNG but on Windows to process lots of pictures

I'm working building a site to sell shoes, and I have at least 34K pictures in one of my HDD I want to upload these pictures to the shopping site, but they need to be compressed first (lossy ...
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1 vote
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Software for editing JPEG files directly? [i.e. block manipulation]

In the case where a JPEG file must be edited, but without leaving the file "apparently" edited (i.e. leaving all metadata, spec-/format-ambiguities, DCT tables, etc., byte-identical to the ...
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1 vote
1 answer
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Software for AI generated pictures

Where can I get Android software that generates AI pictures that can be used as profile pictures in antonymous accounts? I've heard this is possible, but I'm not sure where I can get such an app.
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2 votes
0 answers
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Use a low res image to find the high res version?

I have a low resolution image. I know that I have a higher resolution version somewhere on a backup drive. Is there any software that can use the low res image to find the high res version? Ideally, ...
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1 vote
1 answer
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Mac-compatible software to automatically rotate, de-skew, and crop images

I'm looking for a simple and free application which can automatically scan a document (in the form of a JPG or PNG), change the perspective to remove skew, and then crop it. It would be nice if the ...
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1 vote
1 answer
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Position of points where color changes in image transect

Let's imagine I have an image of a simple object with 2 or 3 (or more) different areas of different color. Now imagine I "draw" a line (transect) or use a tool producing a "virtual"...
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Is there a software that stitch 4 images together to form 1 big image?

Suppose I have a phone with bad camera, I want a good quality image. I take a photo at each corner of a document. So I will have 4 photos. I want to concatenate these photos together to get one big ...
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1 vote
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Program to convert bar-graph visual data to numerical data

Does a program exist to convert already-made bar graphs (in an image file format) to numerical values, where each numerical value corresponds to the height of each bar?
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1 vote
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Fast Static Site Generator for sites with lots of large images

I wrote a photography website using GatsbyJS, gatsby-transformer-sharp, the Directus CMS, and gatsby-source-directus7. It was super easy in development and created a blazing fast static website. The ...
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3 votes
1 answer
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Mobile app to measure rooms and generate floor plans

Is there a mobile application than can measure a room and generate a floor plan? I'm imaging a workflow like taking a series of photographs, and have the app do clever image processing to determine ...
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1 vote
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What Python library / API would you recommend for basic on-screen image and text processing?

I am building an application that interacts with my business's websites, as well as will hopefully manage some of the internal emailing as well. The emailing part is the tricky one; for the rest, I ...
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3 votes
0 answers
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GIMP plugin for rectifying scanned documents on Linux

I use (Devuan) GNU/Linux. I often scan official documents I receive, and want to store them. But the process of scanning (and sometime the original printing) distort the image relative to the original....
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2 votes
1 answer
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Image viewer that randomly displays images from sub-folders using tag filters

I have a parent folder named "Pictures" containing tens of thousands of pictures that are organized in sub-folders that are named by date such as "2020-04-07". Some of these pictures have been taken ...
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