2 types of JPG that can cause problems: CMYK and progressive JPEG. As others have noted on this thread, this is not just a problem with the image engine used by CF, but is a problem with any browser as well. CMYK images will *not* (in my experience) convert properly within CF image functions. As Chuck noted, you can look into the colorspace to determine some of these potential pitfalls, but I find that isImage() is my single greatest friend when it comes to these JPG issues. MIMETypes are no help, of course, since these are really binaries within the correct MIME space ... there just happens to be some critical variation within that space.
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