openframeworks / openframeworks/openFrameworks
ofxCvColorImage doesn't support RGBA images
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- Dominant language
- C++
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Description
Converting an ofImage(.. OF_IMAGE_COLOR_ALPHA) to an ofxCvColorImage using setFromPixels() corrupts the image data.
ofxCvColorImage::init() hard codes iplchannels to 3.
I added a quick fix for this by adding a setNumberOfChannels() method to ofxCvColorImage to change iplchannels to ofPixels::.getNumChannels() before calling allocate() or setFromPixels() and all works fine including converting the ofxCvColorImage back to an ofImage but this is not a great fix.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start at ofxCvColorImage::init() and trace the allocate() and setFromPixels() paths involved in converting an ofImage with OF_IMAGE_COLOR_ALPHA. Check how ofPixels::getNumChannels() relates to the hard-coded iplchannels value; done means RGBA image data converts without corruption and can be converted back to an ofImage.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp, opencv
- Domain
- computer-vision
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100