11-13-2018, 10:04 AM
Well, you don't state two important things: 1) the amount of RAM you have, 2) how big the tile cache is set in the Preferences>Environment.
Your 4"*5"@4800DPI is 460Mpix, so 2.8GB in memory (assuming no alpha channel). In practice you can double that (2.8GB for the layer, and 2.8GB for the composition of the displayed image). As soon as you change something, Gimp makes copies of the layers, so the memory usage grows fast.
Is this color film? Using grayscale you divide your memory needs by 3.
I wonder what kind of photographic emulsion warrants 4800DPI... And if the V700 can scan at 4800DPI, is that really twice as accurate as the 2400DPI scan? And is the 16-bit channel depths true 16-bit, or is it 8-bit padded with 0s, or 8 bits of usable value and 8 bits of innaccurate noise?
Your 4"*5"@4800DPI is 460Mpix, so 2.8GB in memory (assuming no alpha channel). In practice you can double that (2.8GB for the layer, and 2.8GB for the composition of the displayed image). As soon as you change something, Gimp makes copies of the layers, so the memory usage grows fast.
Is this color film? Using grayscale you divide your memory needs by 3.
I wonder what kind of photographic emulsion warrants 4800DPI... And if the V700 can scan at 4800DPI, is that really twice as accurate as the 2400DPI scan? And is the 16-bit channel depths true 16-bit, or is it 8-bit padded with 0s, or 8 bits of usable value and 8 bits of innaccurate noise?