- Subject: [PHOTO] [iris-photos] file size
- From: "Harold Peters" email@example.com
- Date: Sun, 6 Nov 2005 12:47:36 -0800
- Importance: Normal
There are 4 main
techniques to control file size.
The first is
cropping. This eliminates unneeded background. There is no effect on image
The second is
setting pixels (dots) per inch (dpi). As was just pointed out,
monitors show either 72 or 96. What is shown on the monitor when the dpi is 300
or 600 depends on the software being used. Some software shows the entire image
at the monitor's dpi so the image is greater than the size of the monitor.
This is usually hated by the person who received the image. Other software
resizes the image so the image is just full screen. There can be image quality
impacts of the resizing.
The third is image
size. In general, image quality decreases as image size
The fourth is
compression. jpg is a compressed format. The jpg software can adjust the
compression ratio. The greater the compression ratio the less accurate the color
and detail. Considering the lack of color accuracy in the whole process of
obtaining and viewing an image, compressing an iris image to a file size about
50K will be totally acceptable to most of this group. Anyone who needs greater
quality can do so off line.
I have attached a
photo of a Peter Jackson Louisiana iris seedling to show what is possible
in terms of quality and size in a 63K file.
Fortunately I have
DSL and Windows XP so all of this discussion of file size has little
significance to me. However I do remember the bad old days of dialup when I was
quick to remind senders of large files to be more considerate in the future.
Personally I think a restriction of 50K is too restrictive. When I was on a 44k
dialup, I felt the file size limit should have been 300K. Any comments from the
dialupers on what they feel is a reasonable limit. A change in the
recommended file size may be a reasonable compromise.
Beautiful View Iris Garden
2048 Hickok Road
El Dorado Hills, CA 95762
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