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File Sizes


Digital Cameras - ones chooses the quality HQ; SQ; TIFF etc. a better explaination of how this relates to printing out a quality picture.
In other words a HQ file will give what size file with what type of quality. General rules for the output of the digital image.


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March 04, 2002

 

doug Nelson
  We're not blowin' you off, Sharon. It's just difficult when manufacturers call things by their own names. Generally, TIFF gives you an uncompressed image file. When you're at the highest resolution your camera can give, the file size can be huge. If you have any idea of printing your images, or of archiving them to CD, these big file sizes are a necessary evil. Buy the cards you'll need to handle bigger images.
If you're just shooting for instant shots to send or post to a web page, your lowest quality setting might be fine. Most digitals these days give you astoundingly good images on screen, and the file sizes are small enough to send easily.
Your HQ (high-quality?)or SQ (dare not guess) MAY give you an acceptable print. To find out, do some stubby pencil math. Open an HQ or SQ image in the image size screen of your imaging software. Look at the pixel width of the longer dimension of your image. Divide this figure by the longest dimension of the print you expect to get from this image. The resulting figure should be somewhere around the lowest acceptable input resolution your printer maker recommends. If not, try a shorter print size until the right resolution falls into place. When you do this, be sure Resample is NOT checked. You don't want to throw out pixels at this point.
A good minimum print resolution to input to inkjets these days is 240 ppi.
The dpi output figures printer people give us is mostly ad hype, best ignored.


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March 06, 2002

 
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