[Magick-bugs] Re: [magick-users] A grid appears when resizing. It wasn't invited. (Bug?)

[Seth Price]

Thanks, it sounds like a patch is in the works.

I should have mentioned that those unknown tag warnings are expected  
because the tiff is actually a GeoTIFF as exported from GDAL. It's an  
indexed file because each pixel is actually a landscape  
classification (forest, water, etc.). From a GIS standpoint it  
wouldn't make as much sense as an RGB.
Thanks,
Seth


On Sep 14, 2007, at 8:43 PM, Ashley M. Kirchner wrote:

> Seth Price wrote:
>> The output is black. The problem goes away when you compile with  
>> the quantum set to 16. I've tried this on both my and my wife's  
>> computers with the same result.
>>
>> Can anyone verify? Thoughts?
>> ~Seth
>
>    I have: Version: ImageMagick 6.3.3 04/15/07 Q16 http:// 
> www.imagemagick.org
>
>    Running convert on the TIFF to PNG produces a black image.   
> However, it also produces the following errors:
>
> convert: N048W093.sm.tif: unknown field with tag 33550 (0x830e)  
> encountered. `TIFFReadDirectory'.
> convert: N048W093.sm.tif: unknown field with tag 33922 (0x8482)  
> encountered. `TIFFReadDirectory'.
> convert: N048W093.sm.tif: unknown field with tag 34735 (0x87af)  
> encountered. `TIFFReadDirectory'.
> convert: N048W093.sm.tif: unknown field with tag 34737 (0x87b1)  
> encountered. `TIFFReadDirectory'.
>
>
>    Now, I noticed your original TIFF is not in RGB color space, but  
> Indexed.  I re-saved it out as an RGB file (Photoshop) and then re- 
> ran the convert command.  This time I got no errors and the PNG  
> file wasn't black...it was what I would expect it to be, the actual  
> image.
>
>    Just in case the IM team needs more info...
>
>
> -- 
> H | It's not a bug - it's an undocumented feature.
>  +--------------------------------------------------------------------
>  Ashley M. Kirchner <mailto:ashley at pcraft.com>   .   303.442.6410 x130
>  IT Director / SysAdmin / Websmith             .     800.441.3873 x130
>  Photo Craft Imaging                       .     3550 Arapahoe Ave. #6
>  http://www.pcraft.com ..... .  .    .       Boulder, CO 80303, U.S.A.
>