[gradsusr] Command produces a PNG image with transparent color 0 and a background image NE.png

[Arlindo da Silva]

On Thu, Nov 4, 2010 at 10:08 PM, Andrew Revering <andy at f5data.com> wrote:

>  I don't have any direct answers, but some troubleshooting options you
> could try.
>
>
>
> - First…I just want to make sure the files are local and you're not using
> web URLs for their full paths in the command.
>
> - I didn't verify, but I'm assuming the two images have the same exact
> dimensions?
>
> - Maybe try saving the PNG as a JPG or BMP image..perhaps the format of the
> image (bit) is causing issues.
>
> - I'm assuming -t 0 applies to the output being placed on the background,
> and not on the background itself. It doesn’t make sense that it would be
> that way, but perhaps having the -t 0 option before the -b command would
> make a difference?
>
>
>
> With this said, I believe I had trouble doing this myself. I ended up
> writing external code to do some things similar. But you may want to look at
> OpenGrads' gxyat command… I don't recall if it has a background image
> option, but it may be something to check out.
>

At this it does handle the background image automatically, you will need to
use image magick to blend the 2 images.


> I know that the images are much smoother and nicer  looking, but file sizes
> will be much larger if that's a concern.
>
>
>

Read the manual, you can use the pnquant pipe to produce much smaller file
sizes with virtually no quality loss.

   Arlindo



-- 
Arlindo da Silva
dasilva at alum.mit.edu
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