XnView Software

XnTriq wrote:The file's dimensions are 29'875×14'490 pixels. How much memory (RAM) do you have?

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:

• (6 inches × 300 dpi) × (4 inches × 300 dpi) = 1800 × 1200 pixels

1800 × 1200 pixels is 1800×1200 = 2,160,000 pixels (2 megapixels).

The memory cost for this RGB color image is:

• 1800 × 1200 × 3 = 6.48 million bytes.

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 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:

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

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.

• LuraWave
  • jpg2000_lwf.zip\lwf_jp2.dll (32-bit)
    “JPEG-2000 JP2/JPC File format (read/write) (Can only save images up to 4096x4096 pixels)”
• JasPer
  • jp2000.zip\Xjp2.dll (32-bit)
    “JPEG-2000 JP2 File format (read/write)”
• OpenJPEG
  • \XnView\Plugins\openjp2.dll (32-bit)
  • \XnViewMP\plugins\openjp2.dll (32-bit or 64-bit)

• XnView.com: Additional Downloads » I/O Plugins
• Newsgroup.XnView.com: differences between them? (about jpeg2000)

XnTriq wrote: 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:

• (6 inches × 300 dpi) × (4 inches × 300 dpi) = 1800 × 1200 pixels

1800 × 1200 pixels is 1800×1200 = 2,160,000 pixels (2 megapixels).

The memory cost for this RGB color image is:

• 1800 × 1200 × 3 = 6.48 million bytes.

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 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:

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

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.

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.

cday wrote:

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.

XnView MP x32 or x64, and which plug-ins do you have installed?

I could only get the 'can't open' message, but I didn't have time to try all the options.