: Mac app to compare processed image before/after? I often use ImageOptim and ImageAlpha to optimize images. ImageAlpha has a really nice feature because it lets you compare optimized image to the

@Ogunnowo857

Not in any specific order.


Kaleidoscope - ( Mac )
PixCompare - ( Mac )
Pixel Diff - ( Mac )
ImageDiff - ( Mac )
Araxis Merge - 0 give or take ( Mac and Windows )
Image Comparer - ( Windows )
Image Diff Tool - Free ( Mac, Windows, Linux )
Beyond Compare - (Mac, Windows, Linux)
Resemble.js Free ( Web application )


I was thinking that if you wanted to, you could pretty easily extend the functionality of this with a comparison jquery plugin or something, to extend what it can do, like this for instance.

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@Murray664

By "processed image" I assume you mean that the resolution/size/format/colors were changed for, say exporting to the web (rather than the color correction and retouching you might do with Photoshop).

GraphicConverter can do this with the Compare Images menu command. I haven't used this function much, but GC has an impressive array of tools for analyzing the image EXIF, histogram, etc. There's an extensive collection of manuals that come with the program and it's shareware, so worth a look..

Photoshop CC allows you to preview effects of exporting a processed image as a different format (say a jpeg with reduced quality). In older versions this was called "Save for Web" and you had the advantage of being able to compare results of up to four different resolutions. I'm not sure why they removed this feature, unless it was just moved somewhere else.

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