Say I import a TIFF, JPEG, or PDF image. How can I quickly determine the original aspect ratio of the image so that I can properly scale its size? I have thus far been unable to find an answer looking through the manual.
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2 Answers
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ImageDimensions will give you the pixel dimensions of an imported image, from which can calculate the aspect ratio:
img = Import["http://www.eschertile.com/pic/ss-2.jpg"];
ImageDimensions[img]
{858, 705}
answered Mar 24, 2013 at 14:40
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ImageAspectRatioin versions 8 and 9... :) $\endgroup$ Commented Mar 24, 2013 at 14:43
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If you want to know the aspect ration of the image without importing the image itself, you can use "ImageSize" as last parameter to Import
N[Divide @@ Reverse@
Import["http://www.eschertile.com/pic/ss-2.jpg", "ImageSize"]]
which gives the same value of 0.821678 as
ImageAspectRatio[Import["http://www.eschertile.com/pic/ss-2.jpg"]] // N
answered Mar 24, 2013 at 15:16
ImageAspectRatioorImageDimensionsshould do the trick. $\endgroup$