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Questions tagged [processing]

102 questions
620
votes
9 answers

Using ffmpeg to cut up video

I am using ffmpeg to cut out a section of a large file like this: ffmpeg -i input.wmv -ss 60 -t 60 -acodec copy -vcodec copy output.wmv The -ss part works fine but the -t is ignored. It correctly removes the initial specified seconds specified with…
Neil
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64
votes
12 answers

How to extract image from PDF file

I currently use Foxit's PDF reader, and I recently downloaded an image from the Internet, but it is inside a PDF file. How do I extract this image? Operating system is Windows 7.
studiohack
  • 13,477
36
votes
11 answers

How do I batch change the date taken information in EXIF data?

I use F-Spot to manage my images. For one set of images, the dates somehow got messed up and they all are marked as September 1st 2007. I'd like to change the date taken information to a different date. How can I do this?
Eugene M
  • 913
22
votes
4 answers

Paint.NET equivalent for Linux?

On Windows, my favorite image editor is Paint.NET. However, on Linux, GIMP is as unfriendly as photoshop despite having less features. (i.e. It takes ages to load, their's far too much stuff). Most of my image editing is simple things where…
Macha
  • 5,442
17
votes
8 answers

Rotate a MP4 file, while preserving codec and quality attributes

I need to rotate a MP4 video by 90 degrees. There is software like Free Video Flip and Rotate available that does this but produces an AVI file. Do you have any suggestions for a software to produce a MP4 that is in the same quality (and file size)…
thegate
  • 173
17
votes
6 answers

Software to clean up photos of whiteboards and documents?

I take a lot of photos of whiteboards, blackboards, and so on for teaching purposes (examples online through May 2010). I'm interested in cleaning them up for archival purposes, preferably using Linux. Commercial products ClearBoard and PhotoNote…
Norman Ramsey
  • 2,904
13
votes
2 answers

Photoshop: HSL Color picker plugin?

Is there a plugin that can let Photoshop use a HSL color picker, rather than HSV (which Adobe calls HSB)? In other words, any/all of the following locations could have an HSL option: Or perhaps a plugin with it's own color picker. Reference …
Ian Boyd
  • 23,066
12
votes
4 answers

Combine Multiple Audio Files into a single higher-quality audio File

BACKGROUND My team gave a demo to a large audience - we recorded the audio of the demo in multiple locations in the room (3) the audio was recorded using cheap laptop microphones I was not involved in the recording of the audio or the demo Both…
namenlos
  • 243
12
votes
4 answers

If a task takes 10 hours on a 1GHz processor, does it take 5 hours on a 2Ghz processor?

If a task takes 10 hours on a 1GHz processor, does it take 5 hours on a 2Ghz processor? Or am I oversimplifying the issue?
aneuryzm
  • 2,185
12
votes
2 answers

What's the state of the art in image upscaling?

I like to collect cool pics and use them as wallpapers or for other things. Often, artists publish only low-res versions, probably for fear of theft. Example: Now, if I want to use that as a wallpaper, I'd have to upscale it, and obviously that'd…
Stefan Monov
  • 1,711
10
votes
3 answers

How can I easily correct slight rotational misalignment in scanned images

I've got a whole lot of scanned images (> 500) the majority of which were scanned with the paper not completely square. They need to be rotated about 1-5 degrees to be aligned again. Is there any software that does this? I know some scanner drivers…
AndrewR
  • 273
9
votes
7 answers

Is it possible to increase the resolution of an image without expensive software?

Is it possible to increase the resolution of an image (or increase the quality of an image) using some simple software or process? If yes, how might I go about it?
jack.spicer
  • 471
9
votes
4 answers

Linux software for creating HDR images?

Is there any good sofware available for linux for creating HDR images?
chris
  • 9,595
9
votes
5 answers

How can I change all pixels of one color to another color in a picture?

I have an image which looks like this: However, the yellow line needs to be red and the cyan line needs to be green. I have Paint and IrfanView. How can I change the colors of the yellow and cyan line without individually selecting all pixels…
user29116
  • 101
9
votes
2 answers

Automatically remove all music from mp3 talk show

Is there a tool that can automatically remove the music sections of a given mp3 file so only the talking part is left? This would create a better listening experience when listening to the file on my portable mp3 player. Currently I'm doing the task…
Schudel
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