Difference between revisions of "Converting microarray images"
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Microarray images are generally stored as 16-bit [[Wikipedia:TIFF|TIFF]] images (usually around 100Mb in size. An alternative lossy image format is [[wikipedia:JPEG|JPEG]] format, which is still bloated at around 40Mb filesize. Investigating the image size of a typical GenePix derived JPEG image, the pixel size is 4400 × 14300 pixels (72 pixels per inch) with an aspect ratio of 3.25 . A general visual summary of these lossy images is all that is required where they could be converted to a much smaller thumbnail [[Wikipedia:PNG|PNG]] type image using an appropriate program such as [[Wikipedia:ImageMagick|ImageMagick]] or [[Wikipedia:GIMP|Gimp]] which allows batch processing of multiple images a once. | Microarray images are generally stored as 16-bit [[Wikipedia:TIFF|TIFF]] images (usually around 100Mb in size. An alternative lossy image format is [[wikipedia:JPEG|JPEG]] format, which is still bloated at around 40Mb filesize. Investigating the image size of a typical GenePix derived JPEG image, the pixel size is 4400 × 14300 pixels (72 pixels per inch) with an aspect ratio of 3.25 . A general visual summary of these lossy images is all that is required where they could be converted to a much smaller thumbnail [[Wikipedia:PNG|PNG]] type image using an appropriate program such as [[Wikipedia:ImageMagick|ImageMagick]] or [[Wikipedia:GIMP|Gimp]] which allows batch processing of multiple images a once. | ||
| − | + | =Imagemagick= | |
| + | The command line binary ''convert'' is useful for resizing images, for example; | ||
| + | |||
| + | convert -size 800x600 input.jpg'[80x60]' output.png | ||
| + | |||
| + | will resize and convert a [[wikipedia:JPEG|JPEG]] to a [[wikipedia:PNG|PNG]]. | ||
=See also= | =See also= | ||
*[http://www.imagemagick.org/script/index.php ImageMagick website] | *[http://www.imagemagick.org/script/index.php ImageMagick website] | ||
Revision as of 22:58, 10 September 2006
Microarray images are generally stored as 16-bit TIFF images (usually around 100Mb in size. An alternative lossy image format is JPEG format, which is still bloated at around 40Mb filesize. Investigating the image size of a typical GenePix derived JPEG image, the pixel size is 4400 × 14300 pixels (72 pixels per inch) with an aspect ratio of 3.25 . A general visual summary of these lossy images is all that is required where they could be converted to a much smaller thumbnail PNG type image using an appropriate program such as ImageMagick or Gimp which allows batch processing of multiple images a once.
Imagemagick
The command line binary convert is useful for resizing images, for example;
convert -size 800x600 input.jpg'[80x60]' output.png
will resize and convert a JPEG to a PNG.
