A close cousin to regional compression, blurring reduces higher frequency details for smaller JPEG images. Blurring smooths out abrupt color and tonal transitions, making the JPEG algorithm work more efficiently. The amount of savings depends on the amount of blurring, and can range anywhere from 5% to over 20%. The less detail there is in an image, the more efficient the compression.
Weighted optimization or regional compression applies different degrees of compression to different areas of your image. You can use alpha masks to apply different JPEG quality and GIF/PNG lossy and dithering settings to different areas of your image. In many cases weighted optimization can squeeze more bytes out of your images destined for the Web.
Ansel Adams once said that the ideal tripod “is a cubic yard of solid concrete with a 1/4″ X #20 bold head sticking out of the top.” While this certainly would give a nearly vibration-free support, for most photographers this is not a viable option. That’s where tripods come in handy.
Vibration is one of the photographer’s worst enemies. Slow shutter speeds and telephotos usually don’t mix well, often resulting in blurry shots. A stable tripod can help to ensure sharper photographs and videos destined for the Web. But what about situations where a tripod is not an option?