JP2 files evidently need a lot of processing to decompress in images in them when I created a multi-image PDF file using JPEG2000 compression once, stepping throught the pages was noticeably slower than when JPEG compression was used. The uploaded JP2 file which has very large pixel dimensions opens in another popular freeware software, but only after a very long delay. If uncompressed, it is three bytes per pixel.ĭifferent color modes have different size data values, as shown below: The larger it is, the better the image quality. The compressed JPG file will be smaller (maybe 10% of that size), selected by our choice for JPG Quality, but the smaller it is, the worse the image quality. The last "× 3" is for 3 bytes of RGB color information per pixel for 24 bit color (3 RGB values per pixel, one 8-bit byte for each RGB value, which totals 24 bit color). The memory cost for this RGB color image is: Memory cost for an image is computed from the image size.įor a 6x4 inch image printed at 300 dpi, the image size is calculated as:
A few scanning tips Color Bit-Depth, & Memory Cost of Images wrote:Large images consume large memory and make our computers struggle.
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