Apple's Preview program in OS X is a very convenient tool for quickly editing image and PDF files. It supports a number of options for annotating images and adjusting colors, cropping, and otherwise editing them, it can also be used to quickly convert an image to another format.
Preview supports reading most common image format types, and likewise allows you to export them to these same types, so even if Preview is not set to be your default program for handling images, you can still use it to quickly make an image conversion.
To do this, right-click the image in the Finder and choose Preview from the Open With menu. Then choose either Export or Save As from the File menu, and in the Save dialog box you will see a Format drop-down menu that you can use to select the desired image format, which will be either JPEG, JPEG2000, OpenEXR, PDF, PNG, or TIFF. When you select a format, you may see some adjustment options available, such as enabling the alpha channel for PNGs to include transparencies, and setting the compression level for JPEG images.
Selecting multiple images in the thumbnail column will allow you to export them all to the same selected format (click for larger view).
(Credit: Screenshot by Topher Kessler/CNET)
These options are available for single images, but... [Read more]
by Topher Kessler via CNET How To
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