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A while ago I saved some images generated by a web service so the file names are e.g 'ysauyft87ggsa67fgeg&w=1600'. I can open and manipulate these images OK, I'd just like to know what encoding they are (it's almost certainly png or jpeg). I've tried 'get info' in OSX, but it thinks the files are just text (even though it generates thumbnails correctly and I can view the images in preview). If I serve the images on a server they are delivered as 'application/octet-stream'.
How can I easily determine whether they are png or jpeg via the shell?
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Open the image you want to convert into PNG by clicking File > Open. Navigate to your image and then click “Open.” Once the file is open, click File > Save As. In the next window make sure you have PNG selected from the drop-down list of formats, and then click “Save.”
A PNG file is an image saved in the Portable Network Graphic (PNG) format, commonly used to store web graphics, digital photographs, and images with transparent backgrounds. It is a raster graphic similar to a . JPG image but is compressed with lossless compression and supports transparency.
Start by navigating to the location of the document, video, or image, and then perform a Haptic Touch gesture (long-press) on the item. On the menu that pops up, tap Info. You can then see the file format listed next to the file name.
The "magic code" for a
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Three methods:
file command: https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/file.1.html
For example: file 'ysauyft87ggsa67fgeg&w=1600'
identify file like torazaburo wrote in the comments (part of imagemagick lib)
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