![]() ![]() Note I have ignored 'real world photos' which typically do not fit in the above basic groups, but has large numbers of image sub-categories in and of itself (faces, groups, seascapes, buildings, etc)!Īnthony wrote: For methods of sorting images into categories see. While we are on this topic, does anyone have any other basic 'types' of images? Then we can work out something that can detect such images. Or even animations (simple or of real images)īasically you need to define exactly what you want to include or exclude! The other tools do need prefacing by 'magick', such as magick identify or magick montage, etc. Note that for IM 7, use magick, not magick convert. magick -density 300 bw.pdf -alpha off -colorspace gray -threshold 50 newbw.pdf. Note how the IM green color I used in my test image is not a pure green. ![]() Or images with little 'energy' in the form of edges, only smooth color gradients It works for me on IM 7.0.10.16 Q16 Mac OSX Sierra. Negating Images (reversing black and white) Level Adjustment Operator (gray. 0 or 255), it seems odd that you would want to save it as a JPEG which is generally 3-channel and, because it is lossy, perfectly at liberty to change your 0/255 values in order to save space. Or just a small segment of pure color - this rose image as an area of pure white! Having gone to the trouble of ensuring your image contains only pure black and white (i.e. The face is reasonably well converted to black and white, but all the information in the sweater has disappeared and the side of the hand has vanished entirely. Or images with large expanses of pure black or white, or a specific color? The conventional way of stylizing an image of this kind is to use Image > Adjustments > Threshold, which produces this effect by default. mostly two color gradient images (red on white with anti-aliasing) such as this. What about line drawings or text? These are typically not truely black and white but mostly black and white with grey anti-aliasing pixels.For example. Whcih is also closely related to generating Image Metrics, for sorting before comparisons or database storage For methods of sorting images into categories see. ![]()
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