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Is there any free tool available for creating and editing PNG Images?
Paint.NET will create and edit PNGs with gusto. It's an excellent program in many respects. It's free as in beer and speech.
The GIMP (GNU Image Manipulation Program).
It's free, open source and runs on Windows and Linux (and maybe Mac?).
I use Pixlr - an online photo editor, it has great filters and user friendly interface.
Inkscape is a vector drawing program that exports PNG images. So, you end up editing SVG documents and exporting them to PNGs. Inkscape is good if you're starting from scratch, but wouldn't be ideal if you just want to edit existing PNGs.
Note--Inkscape is open source and available for free on multiple platforms.
ImageMagick and GD can handle PNGs too; heck, you could even do stuff with nothing but gdk-pixbuf. Are you looking for a graphical editor, or scriptable/embeddable libraries?
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Does anybody knows which are the best tools for image segmentation?
I'm starting to do a project that evolves in a specific GUI to recognize some parts of the image such as a button, or a text box for example.
Can anybody tell me which sould be the easiest and the most efficient tool for this kind of issues?
Thank You.
Though your question may not be well posed, there are several tool kits for image processing.
One option is OpenCV. This computer vision library can perform a wide range of operations from simple image processing to object recognition for robotics. Here is one quick image segmentation example, straight from the documentation.
This library is powerful, but it may not suit your application. Please consider asking a more specific, technical question.
There are a few toolboxes for pattern recognition in images>
in matlab you can find: https://www.mathworks.com/matlabcentral/fileexchange/46392-pattern-recognition-toolbox
It is called PRTools> http://prtools.org/
and this is for more statistical purposes rather than segmentation>
http://cmp.felk.cvut.cz/cmp/software/stprtool/dwstprtool.html
If you deal with neuroimages, you can then take a look on>
Pattern Recognition for Neuroimaging Toolbox (PRoNTo)
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is there a library with source can be used to read images with different formats?
The library:
is very thin, not like OpenCV with so much code,
is able to read bmp, png, jpeg files,
is self-contained,
does not depend on operating system,
is written using pure c/c++.
is open souce.
Please help me.
Yes, I would suggest CImg - it is a single header file with no libraries to link. It is here.
If you add the following flags to your compilation command, it uses its own built-in routines rather than depending on ImageMagick, for example:
gcc -Dcimg_use_png -Dcimg_use_jpeg -Dcimg_use_tiff -Dcimg_use_curl ...
Additionally, if you define cimg_display as one of the following values, you can get certain advantages:
0 - you cannot natively display anything, but you do not require X11, or GDI to compile and link against - this is great on embedded hardware
1 - you can use X11 for displaying images easily
2 - you can use Windows GDI to display images.
You can find related questions/answers on StackOverflow by putting [cimg] as well as any other terms you want to search for in the search box at top-right of this screen.
Another option would be libvips - it is significantly faster and lower memory overhead than CImg, but maybe not as pure C++ (IMHO).
It is here. You can find related questions/answers on StackOverflow by putting [vips] in the search box at top-right of this screen.
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I am working on a WP7.5 application where I have to download multiple images
and show them in a list.
The images may be PNG, JPEG, or GIF.
For the first two extensions its not a problem, but as we know,
to show/play a GIF image on WP7, there are some other libraries or controls.
(I tried using ImageTools http://imagetools.codeplex.com/; and it worked fine.
But the control it provide cannot render images other than GIF (or may be I didn't found the way).
Is there any tool or custom control or API which can render all types of images, so that no matter what extension it is, the image is showed?
WP7 uses silverlight and silverlight doesn't support GIF images.
Please check these links for information regarding the same. http://forums.silverlight.net/p/39235/112333.aspx
and you may also find some useful answers to your question here: Displaying a GIF in Silverlight
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I want to write a program that processes images.
If there are good algorithm libraries in object extraction that would save me a lot of work.
anybody?
are there any good libraries in image processing?
I am willing to use c++ or c# whatever has good libraries.
Thanks
Try out OpenCV.
This depends on your focus in image processing.
If your focus is image processing on digital camera images, I would suggest using OpenCV (as already mentioned by #ffriend). If your focus is image processing on radiological images (MRI, CT, etc.) I would suggest using ITK for the processing algortihms and VTK for rendering.
All those libraries are written in C++. Some have interfaces to scripting languages like python.
Hope this helps for a start!
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I want to write a program that will generate random notes and draw them on the screen on a staff. I want to use Cocoa or Cocoa Touch. What's the best way to go about displaying the notes? Should I somehow use a music font, or pngs of each note, or what? Are there any good tutorials or sources of info out there on this topic?
I would be very tempted to use a custom music font and render it using the new ability in iOS4 to import custom fonts (I'm pretty sure it's iOS4 in general, and not just the iPad). I also assume that the entirety of CoreText is available on the mac too, but even if not, I'm sure the code wouldn't be vastly different.
Anyway, you can read about loading custom fonts here;
http://www.freetimestudios.com/2010/09/20/ipad-and-ios-4-custom-font-loading/
Or the slightly more hardcore way here;
http://www.freetimestudios.com/2010/09/13/custom-fonts-on-the-ipad-and-ios-4/