In this youtube video I show how I compressed over 12 000 images from over 21GB to less than 2 GB for my digital photo frame. The video will tell you how to batch compress an image without any appreciable loss of quality using free software easily and efficiently. The software I use is irfan view which is a free (but closed source) software to edit and manipulate all sort of digital images and will work for Windows and Linux. I do not specifically tell which settings will suit which conditions in the video itself. So I give you some guidelines as to which format and resolutions will yield best result in different circumstances.
1. Which Format to Select?
Save as JPEG if image is a natural image captured using a camera. Is best for smooth colors. Save quality of 85 if optimal for viewing on screen, 90 for printing and 75-80 for web publishing.
Save as PNG (Portable Network Graphics) if the image looks like a cartoon with solid colors or has very few colors and sharp boundaries (like a scanned black and white document)
JPEG is good for smooth gradients with lots of color while PNG is better suited to sharp images with solid colors
2. What resolution to use?
The table below gives suggested resolutions that should work in most situations.
Resolution and quality table
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