ECW Mapping Files

[steve @ mp]

Hi,

I have a number of drawings which use digital aerial photography images in ECW format. I have a plugin from ER Mapper which can handle these files and works well.

When I come to print them out the quality is awful and appear very blocky. There are options within the plugin which allows the user the change the output DPI up to a maximum of 600. I have done this and still the output is the same.

Has anywone here had any experience of using ECW mapping files and printing them out...?

Any help would be much appreciated.

Regards

Steve

[Alan Cullen]

Hell, mate...I've never heard of ECW....but I am a surveyor......I may be able to help.......if I knew exactly what you are talking about......

600 DPI is plenty good enough for plotting.......as long as it doesn't diminish as you increase the size of the base drawing which started off as 600 DPI........

Bit more explanation would help, mate........

[Norts]

i think the print quality of these ecw files will depend greatly on the actual resolution of the ecw files themselves. if they have a low resolution, there is very little you can do to increase the printed quality of them.

[steve @ mp]

Hell, mate...I've never heard of ECW....but I am a surveyor......I may be able to help.......if I knew exactly what you are talking about......

600 DPI is plenty good enough for plotting.......as long as it doesn't diminish as you increase the size of the base drawing which started off as 600 DPI........

Bit more explanation would help, mate........

AFAIK ECW (Enhanced Compressed Wavelet) mapping is developed by Earth Resource Mapping (ER Mapper). It is a mutli-layered file that increases in quality the further you zoom into it. That's the best I can explain it.

Basically when I print what should be a high quality image I get an image that looks rather like an old VGA image (Similar to atatched image 2).

That attached screen dumps may help you understand although I doubt it.

Regards

Steve

[steve @ mp]

i think the print quality of these ecw files will depend greatly on the actual resolution of the ecw files themselves. if they have a low resolution, there is very little you can do to increase the printed quality of them.

The images are "very" high quality, please see images on previous message.

Regards

Steve