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I have got an 18Gig .ecw file here at work, and a contractor has asked for a lower quality one that could be burned to DVD or put on thumb drive (i know we can get big thumb drive, but the DVD option is better for us) so im trying to work out how to convert the 18Gig to be a smaller 4gig file.
I have done the obvious thing of opening it in Irfanview, clicking save as, then reducing quality to abot 3:1 as per the options, and this dramatically reduces the file size to about 10meg, while still being adequate for what contractor needs. But when i bring this new ECW into my MXD map it comes up with warning - see photo below.
So i open Catalog and import the same coord system as all my projects/files and try again, but the error still comes up, and the image doesnt project on my plan.
Does anyone know why this is happening, and how i can resolve this?
I usually find it the easiest to just choose "Set new size as percentage of original", and set for example 50% to reduce the number of image pixels to 1/4 of the original. Combine this with a moderate target compression of let's say 10:1, and you may have a decent smaller image with still good image pixel quality.
I just had a go with the Batch Conversion, but that percentage of original option will physically resize the image size, and the objective is to provide a georeferenced aerial photograph, so in my instance that one wont work.