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0
votes
1answer
27 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
46 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 ...
0
votes
1answer
79 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 ...
3
votes
0answers
41 views

Heterogeneous (cpu+gpu) System Architecture using C++ [closed]

I want to develop an image processing system on a computer that has both multi-core CPU and GPU (I don't have such a computer yet, so this is part of the question too - what cpu and gpu models are ...
0
votes
0answers
18 views

How can I make images converted by NConvert smaller?

I am using nconvert to convert screenshots generated by "The Elder Scrolls Online", which are in BMP, to PNG. 1 BMP has around 7 MB, the resulting PNG has about 3MB. This is still very big to upload ...
-1
votes
1answer
483 views

Document scanning: How to speed up the software part of the scanning process? [closed]

I am looking for a solution to speed up my document scanning process, especially for those documents that are not suitable for a typical document scanner with an automatic document feeder (ADF). For ...
2
votes
2answers
939 views

How to convert an image from perspective projection to orthographic projection?

Sometimes you want to make a 2D image on the computer from a real life 2D image, but for whatever reason you can't get a straight, front-on view of the image. Say it's a billboard and you can only ...
2
votes
1answer
125 views

How to draw pixel-perfect geometric shapes and patterns?

When designing user interfaces, games and other visual applications, very often you have to have an image with a well defined geometric pattern. Some examples: A placeholder image of given size with ...
1
vote
1answer
161 views

Converting JPG to BMP, then back to JPG without loss

Someone has converted a number of JPG's to BMP's, and then to PNG, under the assumption that it will "increase quality". Of course, it doesn't, as once you've introduced lossy compression you can ...
-4
votes
0answers
47 views

Resizing image for facebook [closed]

Yesterday I took a night shot of Hooghly Bridge with D5100, and it was cool :) I resized down the image to 2048*1356 px using Photoshop CS5 [default settings] and uploaded the image to Facebook. ...
0
votes
0answers
244 views

How to stitch planar images? [duplicate]

Suppose I have perfect planar fragments of a big image. How to stitch them automatically? Software should detect edge features but should not expect camera calibration.
2
votes
2answers
2k views

Getting the predominant colour in an image?

Is it possible to get the predominant colour in an image from the command line? Ideally I'd like it back as hex or RGB. I thought it might be possible to do this with imagemagick's identify command, ...
0
votes
0answers
181 views

Has anyone successfully installed cygwin/xview/wfdb/ecgpuwave recently? Does it work?

I am having a problem with cygwin/xview/wfdb/wave/ecgpuwave. Having installed CYGWIN successfully, I installed XVIEW followed by WFDB according to procedure specified at: ...
0
votes
2answers
1k views

Convert gif to svg using inkscape

Is there any way to convert a gif file to svg using command line inkscape? I would like to convert the gif to a "real" svg but bot just embed the gif into the svg. Or any other command line tool to do ...
0
votes
1answer
893 views

PDF to PNG with ImageMagick/GhostScript: Colorspace=sRGB breaks script

In order to convert a PDF with 100 pages to single PNG files, I've been using the following command: C:\Program files\ImageMagick\convert -density 150 -alpha Opaque file.pdf file.png But that ...
1
vote
1answer
4k views

Windows: Batch processing images with GIMP and saving them to new files

On my windows machine, I want to use GIMP to modify all PNG files (filename.png) in the current directory and to save the output file to the sub-directory out/filename.png. The processing that is ...
1
vote
4answers
836 views

Software that can identify and remove foreground objects from image [closed]

I am interested in removing extraneous objects from an image. More specifically the situation is that there is a series of images of a particular background. In each image there are objects in the ...
14
votes
3answers
16k views

I want to change DPI with Imagemagick without changing the actual byte-size of the image data

I feel so horribly sorry that I have to ask this question here, but after hours of researching how to do an actually very simple task I'm still failing... In Gimp there is a very simple way to do ...
1
vote
1answer
2k views

Batch processing with ImageAlpha

I am trying to figure out how to do batch processing with ImageAlpha. I really like this program, but I cannot figure out how to batch process. Just to be clear, I am trying to convert several images ...
1
vote
2answers
182 views

How can I batch-process (crop) these images?

I would like to know how to (as fast as possible) mass edit (means everything at once - around 100 images): What I want to do is remove both (upper and downer one) big black lines as well as remove ...
2
votes
0answers
486 views

Gifsicle: How to set it to not overwrite the original GIF file if the resulting modified GIF file is larger than the original?

About Gifsicle: Gifsicle is a command-line tool for creating, editing, and getting information about GIF images and animations. One of its features is (from its website): Optimize your ...
1
vote
1answer
213 views

Is there a simple image tool on mac to read alpha value of a pixel?

I am looking for a simple tool that will let me read the RGB and alpha (A) values of a pixel in an image. Something like DigitalColor meter but that returns alpha values. I know this is possible in ...
0
votes
2answers
1k views

How do I make floor plans from photographs?

I'm looking for software or an online service that can take multiple photos of the inside of a house and create a 2D or 3D floor plan. Such software has been under development by the computer vision ...
0
votes
1answer
530 views

Why does gm always export all layers of the input image?

Given the following command line: '/usr/bin/gm' convert 'directory/filename.psd[0]' filename.jpg I will always receive all layers from the .psd as output: $ ls something* something.jpg.0 ...
4
votes
1answer
810 views

Is there any software to analyze and detect 'fake' hi-res images (TIFF when really JPEG, deliberately upscaled images)?

In my line of work I often work with images for print marketing from multiple sources and occasionally when I have asked for hi-res images (instead of initially the low-res ones that they start by ...
1
vote
2answers
1k views

Detecting blank image files

I am using scanimage with a document scanner (Canon DR-2510C) that supports duplex scanning. Unfortunately, its SANE driver does not support blank page detection, so that with mixed pages ...
1
vote
1answer
390 views

Best practice for editing multiple images in the same way

I have a project that I'm working on that requires me to edit 8 similar images in the exact same way. In other words, I need some way that whatever I change on the first image, I need to be able to ...
0
votes
1answer
41 views

A tool (library, source-code, algo) to select area in an image based on perceived focus plane

Say we have an image in which a human eye can distinctly see several "planes" of focus - a blurry background ("telelens"), the sharp(er) subject (a human, or an object), and again a blurry foreground ...
1
vote
2answers
71 views

How do I combine several images into a single one?

Is there a program that let's me choose separate image files and output it as one whole image with the images lined up horizontally as a transparent gif?
1
vote
1answer
570 views

How to join multiple images into one preview

I have hundreds of vector clip art sets (EPS and AI) with JPEG previews for each vector image and I need to create nice preview image for each set (preview image must contain all jpeg previews of one ...
3
votes
2answers
1k views

How to uniformly change color of an image?

I have an image that is kind of reddish/orange: Is there a tool (e.g. Photoshop, Paint.NET, etc...) that let's me pick a different color set (say green) and that would color the image accordingly. ...
0
votes
4answers
28k views

How can I combine multiple GIFs into one GIF file?

How can I combine multiple GIFs into one GIF file? I just want to display the images side by side.
2
votes
1answer
247 views

Software to aid using camera as a scanner

I want to digitize some index cards with my camera. I'm looking for a program that would automatically fix geometry on the shots (as you would expect the cards come tilted on the picture). I have an ...
0
votes
3answers
389 views

Tool to repair line drawings / diagrams wrongly saved as jpgs

When you compress a line drawing as a jpg, it goes kind of blurry. Areas of solid colour become areas of slightly variable colour etc. Are there any tools out there that attempt to fix this kind of ...
5
votes
2answers
3k views

How to stretch an image in one dimension?

The title says much, but I'll explain in detail a little more. I need to stretch an image in one dimension only. That is, if the image is for example, 100x100 (Width x Height) I need it to be 100x104 ...