Another great post on Mike Kleiman's blog. This time he offers some great tips with regards to image formats, size, etc. Here are some of the takeaways:
- JPG’s are best for larger graphics that consist primarily of images, such as a masthead photograph. GIF’s are perfect for smaller items which contain less colour complexity and/or text – graphical buttons, for example.
- Avoid saving anything in a format other than JPG or GIF. Though you might be tempted to save an image as a PNG for the sake of maintaining opacity percentages – it’s not a good idea. They work, but your file size will be huge. Instead, try to find a workaround or a different way to lay out the design.
- the difference between saving a JPG at 80% quality in Photoshop as opposed to 40% is usually negligible. Tinker with it to see how low you can bring down the percentage before the image becomes distorted. A jump from 80 to 40 may only have minimal visual impact but can save you a lot in the file size department.
- Take a step back and figure out what needs to be an image and what doesn’t. Often using simple HTML and inline CSS can replace the need for an image.
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