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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.
Image size is directly proportional to the number of pixels in the image.
The format also has limitations that make it less flexible.
The resolution that a printer can use maxes out at around 300 to 350 dpi at 100%, so any files with more resolution are just bigger files and will not lead to any better quality. JPEG (Joint Photographic Experts Group) or JPG is a popular file format.
PNG (Portable Network Graphic) is also a popular Web and computer screen format.
TIFF (Tagged Information File Format) or TIF is the standard image file format for commercial printers.
These files should be saved in CMYK mode, and bigger is better.
BMP (Bitmap) is an uncompressed proprietary format invented by Microsoft.
It is an exact representation of an image area on a computer screen.
The file size is small and allows a much better color range than GIF.