Moderators: helmut, XnTriq, xnview
My free ram is 1.92G nowXnTriq wrote:The file's dimensions are 29'875×14'490 pixels. How much memory (RAM) do you have?
1.92 GB of free RAM should be enough for ct001844.jp2 (29'875 × 14'490 × 3 = 1'298'666'250). Can you open the file in other programs?A few scanning tips [url=http://www.scantips.com/basics1d.html]Color Bit-Depth, & Memory Cost of Images[/url] wrote:Large images consume large memory and make our computers struggle. Memory cost for an image is computed from the image size.
For a 6x4 inch image printed at 300 dpi, the image size is calculated as:
1800 × 1200 pixels is 1800×1200 = 2,160,000 pixels (2 megapixels).
- (6 inches × 300 dpi) × (4 inches × 300 dpi) = 1800 × 1200 pixels
The memory cost for this RGB color image is:
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).
- 1800 × 1200 × 3 = 6.48 million bytes.
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 larger it is, the better the image quality. If uncompressed, it is three bytes per pixel.
Different color modes have different size data values, as shown below:
File Compression techniques can make this data smaller while stored in the file, but it comes back out of the file uncompressed, with the original number of bytes when open in memory. JPG artifacts (lossy compression) just means the pixels may not all be the same original color, but there is the same number of pixels when uncompressed.Code: Select all
Image Type | Bytes per pixel -----------------+---------------------------------------- 1 bit Line art | 1/8 byte per pixel | (1 bit per pixel, 8 bits per byte) 8 bit Grayscale | 1 byte per pixel 16 bit Grayscale | 2 bytes per pixel 24 bit RGB | 3 bytes per pixel | Most common for photos, for example JPG 32 bit CMYK | 4 bytes per pixel, for Prepress 48 bit RGB | 6 bytes per pixel
I can open it in IrfanView.XnTriq wrote:
A few scanning tips [url=http://www.scantips.com/basics1d.html]Color Bit-Depth, & Memory Cost of Images[/url] wrote:Large images consume large memory and make our computers struggle. Memory cost for an image is computed from the image size.
For a 6x4 inch image printed at 300 dpi, the image size is calculated as:
1800 × 1200 pixels is 1800×1200 = 2,160,000 pixels (2 megapixels).
- (6 inches × 300 dpi) × (4 inches × 300 dpi) = 1800 × 1200 pixels
The memory cost for this RGB color image is:
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).
- 1800 × 1200 × 3 = 6.48 million bytes.
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 larger it is, the better the image quality. If uncompressed, it is three bytes per pixel.
Different color modes have different size data values, as shown below:
File Compression techniques can make this data smaller while stored in the file, but it comes back out of the file uncompressed, with the original number of bytes when open in memory. JPG artifacts (lossy compression) just means the pixels may not all be the same original color, but there is the same number of pixels when uncompressed.Code: Select all
Image Type | Bytes per pixel -----------------+---------------------------------------- 1 bit Line art | 1/8 byte per pixel | (1 bit per pixel, 8 bits per byte) 8 bit Grayscale | 1 byte per pixel 16 bit Grayscale | 2 bytes per pixel 24 bit RGB | 3 bytes per pixel | Most common for photos, for example JPG 32 bit CMYK | 4 bytes per pixel, for Prepress 48 bit RGB | 6 bytes per pixel
XnView MP x32 or x64, and which plug-ins do you have installed?ckit wrote:Opens fine for me with XnViewMP 0.83, Win10 Pro x64 build 1607 or RS1 but it takes a really long time (40 seconds) to do it.
XnViewMP x64 and default plug-ins only which as far as I know are the only ones available.cday wrote:XnView MP x32 or x64, and which plug-ins do you have installed?ckit wrote:Opens fine for me with XnViewMP 0.83, Win10 Pro x64 build 1607 or RS1 but it takes a really long time (40 seconds) to do it.
I could only get the 'can't open' message, but I didn't have time to try all the options.
