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I am taking a jpg image and using numpy's fft2 to create/save a new image. However it throws this error
"IOError: cannot write mode F as JPEG" Is there an issue with CMYK and JPEG files in PIL???
p = Image.open('kibera.jpg') bw_p = p.convert('L') array_p = numpy.asarray(bw_p) fft_p = abs(numpy.fft.rfft2(array_p)) new_p = Image.fromarray(fft_p) new_p.save('kibera0.jpg') new_p.histogram() 
518
If you have a P mode image, that means it is palettised. That means there is a palette with up to 256 different colours in it, and instead of storing 3 bytes for R, G and B for each pixel, you store 1 byte which is the index into the palette.
Semente's answer is right for color images For grayscale images you can use below:-
new_p = Image.fromarray(fft_p) new_p = new_p.convert("L") If you use new_p = new_p.convert('RGB') for a grayscale image then the image will still have 24 bit depth instead of 8 bit and would occupy thrice the size on hard disk and it wont be a true grayscale image.
23
Try convert the image to RGB:
... new_p = Image.fromarray(fft_p) if new_p.mode != 'RGB': new_p = new_p.convert('RGB') ... If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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