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headly
01-16-2004, 02:14 PM
I apply an image map to the diffusion channel but I get an out of focus render (particularly around the black edges). What am I doing wrong?

The attached image shows a piece of the original followed by the rendered result. The blur/fuzzy focus becomes more apparent at higher (print) resolutions.

http://www.headly.com/graphics/mapimages.jpg

Aegis
01-16-2004, 03:18 PM
What resolution is the original image? If you render it at a higher resolution LightWave will scale it up which will cause it to blur - try turning off pixel blending and texture anti-aliasing for the image in the surfaces panel.

headly
01-16-2004, 04:10 PM
Thanks for the reply.
I've tried the image at 72, 100 and 300 dpi, it doesn't seem to matter (at 100 dpi the original image is about 3000x1000, I'm rendering at 8000x8000 but even if I render at 1000x1000 I get the same result).
I will try your advice with turning off the Pixel blending and texture antialiasing options and post another reply with the results. Thanks for the advice!

headly
01-16-2004, 04:18 PM
Seems to have gotten worse, image still fuzzy/soft focus and the black border is more pixelated than before.


http://www.headly.com/graphics/mapimage2.jpg

Aegis
01-16-2004, 05:38 PM
Where did you get the image? Did you scan it? What resolution (in LightWave) was that last render? If you're just changing the DPI in Photoshop of an image you already have then Photoshop's doing the same thing LightWave does - just scaling the image up. That last render looks right (turning off pixel blending/texture anti-aliasing stops LightWave from blurring the image when it scales it) - just very low-res... :confused:

headly
01-16-2004, 05:59 PM
This is a good point, one that I haven't seen addressed anywhere (yes, I searched the forums too)

The 64k question:
Is there a particular reason to use an image map resolution above 72dpi, given that the camera is capturing at 72dpi? Having a 50mb 300dpi Targa file doesn't (appear to) improve the quality of the render.

FYI, this image is a piece of a Digital Wisdom Mountain High Map.

Aegis
01-17-2004, 07:31 AM
Well, as far as LightWave is concerned there is no such thing as DPI - LightWave works just with the true resolution of an image (i.e. 72 DPI) so for example:

10cm x 10cm image @ 72 DPI = 283 x 283 pixels

If you scan that in @ 300 DPI instead of 72 you'll get a 1181 x 1181 pixel image with much finer detail however if you scan at 72 and change it to 300 DPI in PhotoShop then you'll have a 1181 x 1181 image that's really only got the same level of detail as your 283 x 283 original (albeit with a lot of ugly smoothing).

Check out your images at a high zoom in PhotoShop to see whether what you've got is a low-res image scaled up to a high DPI - If that's the case then you're unlikely to be able to improve on the renders you've already got...