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Photography.12

Posting images in the Cafe

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{Photography.12.12}: Peter Fraterdeus {pfraterdeus} Tue, 22 Jul 2003 14:13:59 CDT (HTML)

Kai wrote:

**There is a drop off, of course. That is unavoidable. Sometimes, though, it is amazing how small a file size can get, and other times it is frustratingly hard to get it below 100k without an unacceptable drop off for posting. Most of the time, though 20-50 is possible for a 6 to 8 inch image (at 72dpi, so it depends on your monitor's resolution).**

JPEG encoding analyses the image for areas of similarity, and encodes these (typically square) chunks as a single value and a location in the frame. Therefore, highly detailed, high contrast images will not compress as much as blurry ones or images with large areas of similar value/color.

For display on the web, I've always thought it makes the most sense to reduce the size of the image to no more than 700-800 px horizontal, and smaller if possible. At least get it down to under 100K.

Another tip. I almost always use a thumbnail as a 'LOWSRC' in the <img> tag.

This will load VERY quickly even on a slow modem link, and fills the space that the image will eventually occupy.

using Kai's example above, I'd modify it to:

<img src="http://yourdomain.com/yourdirectory/imagename.jpg" lowsrc="http:// yourdomain.com/yourdirectory/imagename_tn.jpg">

where imagename_tn.jpg is the thumbnail, which at 1 x 1.5 inches will be 1% of the filesize (+-) of an original 10x15 inches (not 10% -- 1 %! since the area decreases as the square of the linear dimension!)

For an example of how this works, check out a site I designed for a VERY good pro at www.andrewmartin.com

For some of my stuff, at this point, my fotolog has more than my own site!

that's www.fotolog.net/ peterf

Great to see a new photo forum. I'll be interested to see the work here! Fotolog.net has some really amazing images!

Ciao

Peter

www. fraterdeus.com

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