How can I reduce the file size of an image file?
Answer: If you have a large image file, the most effective way to reduce the image size is to save the file in a compressed format, such as a .JPG, .GIF, or .PNG file. If the original image file is uncompressed, such as a .TIF, .BMP, or .PSD file, the compressed version will most likely be 5% - 50% of the original file size.
Use the following guidelines when choosing a specific type of image compression.
Of course, you can also reduce the image size by shrinking the actual size of the image. For example, if your image is 6000x4000 pixels and you don't need the image to be larger than 3000x2000 pixels, you can reduce the image size by 50%. A 50% reduction in image size can reduce the file size by as much as 75% since the resulting image only has 1/4 as many pixels.
You can also reduce the image's DPI to save disk space. For example, reducing a 600 dpi image to 300 dpi may shrink the file size as much as 75%. However, if you print the image, the resolution will not be as high and the image will not be as sharp.
Most basic image editing programs can perform all of the above procedures. Some common image editors include Adobe Photoshop, Adobe Photoshop Elements, ACD Systems ACDSee, Corel PaintShop Pro (Windows only), and Pixelmator (Mac only).
Entered: September 19, 2012 – by Per Christensson
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