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I need to save picture without losing any data. Using PNG is not an option as it takes more than 5 seconds to save and this is too slow for my project.

I used campera.capture('image01.data','yuv') as suggested by official documents to store data without compression.

Then I used the same document to read files and convert YUV format to RGB. Document link: Pi camera offical document

but this is what I get: enter image description here

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If you want your data to be stored in RGB rather than YUV, you could try

camera.capture('image.data', 'rgb')
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    Using RGB doubles the size of files, so it takes again more than 5 seconds to capture and write data on SD card, specially with max resolution on camera V2. RGB files are about 22mb in this case. – Hadi Oct 7 at 10:06

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