Operation on BMP, TIFF images

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LOKESH 2012-4-26

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https://ww2.mathworks.cn/matlabcentral/answers/36603-operation-on-bmp-tiff-images

The Algorithm for Grayscale works for JPEG images by dividing it into 3 components-R,G and B. How can it be applied to a BMP or a TIFF file. Do I need to change my algorithm or some Technique will work just as the case for Color JPEG images.

Any suggestions...

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Geoff 2012-4-26

Bitmaps and tiffs are generally RGB as well. The difference with BMP and TIFF is that the file formats support an alpha channel as well. But this won't affect your image data. Are you actually experiencing a problem? Perhaps you need to provide more information.

LOKESH 2012-4-26

Thanks. I mean to say can I divide the TIFF and BMP Color images to R,G & B components as RGB Image & convert back to TIFF or BMP images respectively with cat().

Dividing it into RGB components can give 3 Grayscales on which I can apply my algorithm which works with grayscale images.

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Answer 1

Walter Roberson 2012-4-26

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https://ww2.mathworks.cn/matlabcentral/answers/36603-operation-on-bmp-tiff-images#answer_45769

Yes. You read all those image varieties using imread(), getting out image data without any remaining information about the file format. You use imwrite() to write image data to an image file.

JPEG images are always RGB. BMP might not be. You can look at ndim() of the image data: if it is 4 then you have CMYK or RGBA; if it is 3 then you have RGB; if it is 2 then you have grayscale or binary.