Question about Canon PowerShot A75 Digital Camera

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Procedure for reducing pixels to minimun per exposure

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Click on the link below to download the Canon Powershot A75 digital camera user manual. Scroll to page 40 to view the compression and resolution options.

http://ec1.images-amazon.com/media/i3d/01/A/man-migrate/MANUAL000050468.pdf

http://www.amazon.com/Canon-PowerShot-Digital-Camera-Optical/dp/B0001G6U4S

Posted on Feb 01, 2010

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Posted on Jan 02, 2017

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How do I reduce scan file size when the resolution is already 200 dpi?


An 8.5 inch wide document scanned at 200 dpi gives you an image that is 1700 pixels wide. This is almost enough to fill a fullHD TV screen at native resolution (1920 pixels wide) which is unnecessary detail. I would use any picture editing programme (many free ones available) to reduce the overall pixel width of your already scanned images by 50 percent. This will automatically reduce the 1MB image to 250k. If you can scan again, use 100 dpi to scan - the result is same; image will be half as wide (and long), and picture file size one quarter of the 200 dpi scan.

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Open control panel and go to display. You can reset the screen resolution there if your monitor will accept it and your display card will generate it.

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Pixels per inch (PPI) is a measure of the sharpness

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you need a minimun of shader 3.
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Touch the on-screen button(shows as a finger) to bring up the MENU, touch Image Size(two little squares) , select 1M (1280x960)

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1 Answer

Per-pixel rendering


the message is clear, the problem is clear, the solution is:
- upgrade your videocard to one that does support per pixel rendering,
- simply not to use that option,
- try to find another piece of software that has the same functionality but doesnot require per pixel rendering,
- get in touch again with the card manufacturer and see if per pixel rendering is indeed not available,
- if possible, buy another graphics card that has the option and put them in SLI (if supported) which will improve your graphics for other software as well.

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1 Answer

Extremely long time writing to CF card


IIRC these cameras support a noise reduction feature through a custom function. The camera will take a second exposure with the shutter closed (i.e. against something pure black) to see which pixels in the camera are "hot", and then will use that information to remove that hot pixel noise from the original image. "hot" pixels depend on temperature and exposure length so the camera would need to do this on every shot.

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1 Answer

What are defect pixels?


Ocassionally images from digital cameras will have "defect" pixels. These pixels may appear in the final photograph as bright white, green or red spots that are out of place when compared to the rest of the image. Sometimes people call these spots "hot" or "dead" pixels. Usually these pixels, and other types of "digital noise" appear in the darker or underexposed parts of images; additionally, images taken at longer exposure times are much more likely to have this issue. Many Nikon cameras have a "noise reduction" or "NR" process that fixes these problem areas. When NR is activated and image exposure times drop below 1/4 of a second the NR automatically processes the images as they are saved. This Noise Reduction feature is sometimes called "Night Portrait" or "Night Landscape" Scene Modes. If these spots are seen on images photographed under normal conditions (bright light with exposure times shorter than 1/4 second) then the camera may need to be sent in to a Nikon Service Center for repair. Notice the green defect pixel near the center of this image.

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1 Answer

What are defect pixels?


Ocassionally images from digital cameras will have "defect" pixels. These pixels may appear in the final photograph as bright white, green or red spots that are out of place when compared to the rest of the image. Sometimes people call these spots "hot" or "dead" pixels. Notice the green defect pixel near the center of this image. Usually these pixels, and other types of "digital noise" appear in the darker or underexposed parts of images; additionally, images taken at longer exposure times are much more likely to have this issue. Many Nikon cameras have a "noise reduction" or "NR" process that fixes these problem areas. When NR is activated and image exposure times drop below 1/4 of a second the NR automatically processes the images as they are saved. This Noise Reduction feature is sometimes called "Night Portrait" or "Night Landscape" Scene Modes. If these spots are seen on images photographed under normal conditions (bright light with exposure times shorter than 1/4 second) then the camera may need to be sent in to a Nikon Service Center for repair.

Aug 29, 2005 | Nikon Coolpix 5700 Digital Camera

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