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139
votes
13answers
14k 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
27 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
votes
0answers
26 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 ...
1
vote
3answers
1k 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
67 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 ...
0
votes
0answers
21 views

Fireworks batch process multiple operations and exports

Full disclosure: I have also posted a similar question on Stack Overflow, but that assumes the best fix for this is to edit the batch process script. I have a sneaking suspicion I am failing to ...
1
vote
1answer
67 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 ...
5
votes
2answers
2k 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
50 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
vote
0answers
46 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
vote
0answers
28 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
59 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 ...
7
votes
2answers
832 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
34 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
81 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-- ...
0
votes
1answer
24 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 ...
4
votes
3answers
1k 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
vote
0answers
25 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
41 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
38 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
53 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 ...
0
votes
0answers
54 views

How to add a jpg as a layer in a psd file via script

I have a folder of paired jpg and psd files, like the following: AAA.jpg AAA.psd BBB.jpg BBB.psd CCC.jpg CCC.psd I'm trying to figure out how to merge the jpgs into the psds in an automated way. By ...
1
vote
2answers
128 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
60 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
112 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
487 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 ...
1
vote
1answer
510 views

How to interpret image hex dump?

I'm curious about how the PC actually sees files, and after I did an assignment about files and used hex dump to check if it was writing correctly, I wanted to try it with other file types (actually ...
0
votes
2answers
22 views

What is the codec that increases resolution of image upon adding further data?

On some websites I've seen images that 1st appear bit blurred and then they gradually get better in steps. What is the image codec? Is it PNG? In "The Social Network" The movie title is displayed in ...
0
votes
1answer
44 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 ...
0
votes
1answer
1k 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
3k 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
200 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
479 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 ...
2
votes
1answer
226 views

How to generate images with fixed file size?

I want to generate images with fixed file size (not image size). I've tried some of the solutions here Batch "resize" JPEG images to a fixed file size, but files generated are fixed in size ...
-4
votes
0answers
59 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
407 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.
3
votes
2answers
4k 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
249 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
2k 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
1k 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
5k 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 ...
0
votes
2answers
53 views

Is there an ISO standard for cameras recording date taken? [closed]

My application has a set of images on which computation is conducted. But the issue is that most of the cameras that take the images do not provide seconds in the "Date Taken" field of the image ...
1
vote
4answers
1k 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 ...
23
votes
4answers
27k views

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

In GIMP there is a very simple way to do what I want. I only have the German dialog installed but I’ll try to translate it. I’m talking about going to Picture -> PrintingSize and then adjusting the ...
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
321 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
638 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
285 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
730 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 ...