tiff format convert using imwrite

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K.G
K.G 2017-12-28
回答： Walter Roberson 2017-12-28
Hi all, I have two files in tiff format. One of them is just a black and white text,and the other one is a colorful image. the black and white can be converted only to a tiff format file using imwrite code whereas the latter can also be converted to a jpg format file using imwrite(the same code) can someone explain the difference between these two tiff files and why the latter one is also convertable to a jpg format?

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Walter Roberson
Walter Roberson 2017-12-28
The black and white one probably reads in as a logical array. imwrite() can write logical arrays to TIFF but not to JPEG. To write a logical array to JPEG use
ArrayGray = uint8(LogicalArray) .* uint8(255);
and then imwrite ArrayGray.
Note, though, that this would produce a grayscale JPEG image, which is fairly rare (I have only ever seen one that was not just a demonstration that creating them was possible.) Some systems might refuse to recognize grayscale JPEG images. You might need to do the conversion to Gray as I indicated and then use
ArrayRGB = ArrayGray(:,:,[1 1 1]);
and then imwrite ArrayRGB

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