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file size

  • Subject: [PHOTO] [iris-photos] file size
  • From: "Harold Peters" harold@directcon.net
  • 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 quality.
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 decreases.
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.
Harold Peters
Beautiful View Iris Garden
2048 Hickok Road
El Dorado Hills, CA 95762
harold@directcon.net  www.beautiful-view-iris.com


JPEG image

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