Reasons to optimize
- Save loading time: consider slower internet connections.
- Save bandwidth: in the exmaple beelow, after optimization you can save 482 + 92 - 58 - 11 = 505 KB every time the page is loaded.
- Preserve image quality: browsers do a rather lousy job enlarging / reducing images on the fly.
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Optimization Steps
- Design website and determine the final size of your image by pixel.
- Adjust the image size in photoshop, change resolution to 72dpi.
Use "best for reducing" or "best for enlargement" when necessary.
- Use "unsharpen mask" to sharpen smaller images.
- Use "save for web & devices" to get a balance between image size and photo quality: smallest file size that still looks decent.
- Images large in dimension should be divided into smaller pieces using Photoshop's slicing tool.
- Lots of colors, JPEG... Solid colors or no gradations, GIF. Note GIF also can have transparency.
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