large tif images

[cj5cowboy]

hello all,

In a research project we're producing some pretty big tif files (those are 400-500Mb uncompressed.

I really like using IrFanview and would like to use it for those big files too.

Is there something I can do about it ? (I can't compress the images in a way pixeldata is lost)

Ron

[Bhikkhu Pesala]

That should be possible if you have enough RAM fitted. With 1 Gybte RAM I can load a file of 344 Mbytes, 7,714 x 15,608 Pixels. Consider using PNG if you can, that is only 71 Mbytes on disk, though the memory size is obviously no different.

[cj5cowboy]

Hi,

Well, the image I have is compressed with LZW. It is 445Mb on disk (uncompressed probably a lot more) The image is 27648x20736 24bpp.
The machine I am on has 3Gb ram that should work ?
error msg: ..........\projection-0.tif: Decode error!
Error: Can't allocate memory for result image(s)! Out of memory.

That should be possible if you have enough RAM fitted. With 1 Gybte RAM I can load a file of 344 Mbytes, 7,714 x 15,608 Pixels. Consider using PNG if you can, that is only 71 Mbytes on disk, though the memory size is obviously no different.

[Bhikkhu Pesala]

At a rough guess that is six times bigger than my image or around 1.8 Gbytes in memory. Try turning off use undo on Misc1. Other than that, I don't know what else to suggest.

[cj5cowboy]

ok, that's an idea.

I was kinda hoping that when viewing somewhat bigger files that not the whole image would be loaded in memory. (it would still be possible to move around in an image (slower because of load times).. and also it would be possible to print it. That's probably what is done with satelite images etc too)

At a rough guess that is six times bigger than my image or around 1.8 Gbytes in memory. Try turning off use undo on Misc1. Other than that, I don't know what else to suggest.

[cj5cowboy]

ok, I tried that.. didn't work.

What is funny though is that; I have an image that is 28,000x21,000 buty only 70Mb on disk and irfanview can handle it. I have another image, same dimensions... but disksize 445Mb but irfanview can't handle that one.

The resolution is the same and they are both 24bpp. (That means that they are the same size in memory... right ?)

Ron

ok, that's an idea.

I was kinda hoping that when viewing somewhat bigger files that not the whole image would be loaded in memory. (it would still be possible to move around in an image (slower because of load times).. and also it would be possible to print it. That's probably what is done with satelite images etc too)

[RBob]

ok, I tried that.. didn't work.

I've run into the same problem with a 26693x18017 24bpp tiff file.

I'm running XP Pro SP2 with 2GB ram and IrfanView 4.10

Windows Picture and Fax Viewer can open an display the image, although VERY slowly.

I was hoping to be able to do some simple manipulations and conversions with IrfanView.

[Bhikkhu Pesala]

Have you tried Xnview?

[RBob]

Have you tried Xnview?

Just tried it and with default options (don't know enough about it to change any) it just says "Not enough memory".

Image is 26693x18017x24bpp.

[EDIT] Just made my Windows swap file larger (4GB) and Xnview now handles the file just fine. IrfanView still can't open it.