If you include White Balance settings in a preset applied to a Raw file, and apply that preset to a JPEG file, Lightroom tries to apply the equivalent white balance adjustment (but using the JPEG scale). Therefore, the White Balance adjustment on a JPEG (using a preset based on a raw file) is necessarily an approximation. We try to do the closest job we can, but results will vary somewhat on a case by case basis.
There are a number of file types that Lightroom supports including an extensive list of Camera Raw Formats (for a complete list click here), DNG, JPEG PSD, TIFF, and AVI, MOV, MP4, AVCHD and other digital video files from digital still cameras (click here for a complete list). But every once in a while, I run into a file that Lightroom can’t open because there are a few exceptions:
• PNG (although they can be used for Identity Plates, Watermarks and Layout Overlay).
• Nikon scanner NEF.
• Files that have the longest dimension greater than 65,000 pixels or are larger than 512 megapixels.
• PSD files saved without Maximize PSD and PSB File Compatibility turned on in the File Handling Preferences.
• 32 bit PSD files.
