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Transparency can be saved in the GIF format, as well as multiple images in the same file for use as animated GIFs.PNG (Portable Network Graphic) is also a popular Web and computer screen format.Most images are captured in some digital file format. For negatives and prints, the image needs to be scanned and saved into a digital format.Digital images can be converted into different file formats depending on how it needs to be used.However, with more compression there is more loss of image quality. For printing use, it is best to convert the image to a CMYK TIFF.JPG files are popular for computer and Web use, since the file size is smaller, yet it has a good range of color depth.Bottom Line on File Formats: For commercial printing, the best format is TIFF using CMYK mode.For screen projects (Web viewing, etc.), use JPG, GIF, and PNG formats.
These files should be saved in CMYK mode, and bigger is better.For printing: 300 dots per inch (dpi) or pixels per inch (ppi) at the target dimensions.So for a file that is 3″ x 5″, the pixel density for printing is 900 pixels by 1500 pixels.The file can be viewed without the original application using a free PDF reader that can be easily downloaded from the Adobe web site.Not only is it accessible without the application, the file can be shared across different computer platforms (PC and Mac).
In general, when file formats are converted, some loss of image quality occurs, so it is best to convert images as little as possible.