Question

this link contains some tutorials for image processing and is useful for me, but my problem is it is too slow to process.Actually i would try to processing effect on image when sliding bar. Means when user scroll the slider based on that image processing is done. when image size is 70×70(30kb) it is ok for me(performance was good) but when its size is increasing it will take too much time to process.i have try to reduce the size of bitmap upto 40% using bitmap.compress , but still its size is too large to process.

• Also, will image processing time is depends on colors on image ?
• how to decrease the size of the image/bitmap so image processing not take too much time.
  is there any other way to processing bitmap fast or using above tutorial how i improve the performance?

Answer 1

I don’t know if this will answer your questions, but hopefully it’ll help you.

A few ideas:

1. Do preview processing on a down-sized version of the original image. This will make your processing considerably faster than having to do it on the original full resolution image.
2. Only do processing when the user releases the slider. If the application has to continuously process the image while the user is changing the value of the slider, it’ll take a long time to process the image. Instead, only apply the image effects when the user has released the slider and selected a value. It’ll speed up things considerably. I’m assuming you’re using a SeekBar – if so, you’d need to apply your image effects in the onStopTrackingTouch() method of the OnSeekBarChangeListener.
3. Use RGB_565 for your preview processing. It uses less memory and should make things a bit faster.
4. Optimize your code. Carefully go through your code, and check if there’s anything that could be done in a faster way. One of the usual problems in your case would be creating an excessive amount of Bitmaps.

Hope it helps!