image-manipulation

I am uploading logos to my system, and they need to fix in a 60x60 pixel box. I have all the code to resize it proportionately, and that's not a problem. My 454x292px image becomes 60x38. The thing is, I need the picture to be 60x60, meaning I want to pad the top and bottom with white each (I can fill the rectangle with the color). The theory is I create a white rectangle, 60x60, then I copy the image and resize it to 60x38 and put it in my white rectangle, starting 11px from the top (which adds up to the 22px of total padding that I need. I would post my code but it's decently long, though I

If histogram equalization is done on a poorly-contrasted image then its features become more visible. However there is also a large amount of grains/speckles/noise. using blurring functions already available in OpenCV is not desirable - i'll be doing text-detection on the image later on and the letters will get unrecognizable. So what are the preprocessing techniques that should be applied? Michael Koval Standard blur techniques that convolve the image with a kernel (e.g. Gaussian blur, box filter, etc) act as a low-pass filter and distort the high-frequency text. If you have not done so

I've tried multiple image resizing libraries posted here on SO, as well as with raw java using getScaledInstance . While everything works most of the time, there are two jpeg images for which the colors are always messed up whenever I resize them. First image: Result: Second image: Result: I've tried these images with multiple libraries including Scalr, Thumbnailator, and raw java using image.getScaledInstance() (see here for code), but the result is the same. Any ideas what the problem is? Click Upvote I've found a solution, with a lot of help from this answer : import java.awt.Graphics2D;

I'm looking for something like PIL (Python Imaging Library), which sadly doesn't support WebP images. I'd like to be able to do resizes and crops. Or at least convert to JPEG and then I can work it with PIL. Take a look at: http://code.google.com/p/python-webm/ I was able to walk through the test file to see how they were doing it. imagemagick's convert tool , version 6.5.7-8 or better, can manipulate WebP images . Also, Google provides an encoder and decoder for Linux, Windows and Mac OS X. 来源： https://stackoverflow.com/questions/6876502/manipulate-webp-images-in-python