On Tue, 24 Apr 2001 21:28:52 +0200, Jean-Michel Grimaldi wrote:
>Ron Parker wrote:
>> 
>> I don't see this.
>
>gimp tells me "libpng-1.0.8 error: Too many IDAT's found".
>Though I don't know whether it is a libpng reading bug or a povray
>writing bug.

Hmmm....

|[ron@fwi ron]$ ./pngcheck -v transp.png
|File: transp.png (1051 bytes)
|  chunk IHDR at offset 0x0000c, length 13
|    320 x 240 image, 32-bit RGB+alpha, non-interlaced
|  chunk gAMA at offset 0x00025, length 4: 0.45455
|  chunk sBIT at offset 0x00035, length 4: red = 8 green = 8 blue = 8 alpha = 8
|  chunk IDAT at offset 0x00045, length 48
|    zlib:  deflated, 32K window, default compression
|  chunk IDAT at offset 0x00081, length 45
|  chunk IDAT at offset 0x000ba, length 45
|  chunk IDAT at offset 0x000f3, length 100
|  chunk IDAT at offset 0x00163, length 82
|  chunk IDAT at offset 0x001c1, length 82
|  chunk IDAT at offset 0x0021f, length 82
|  chunk IDAT at offset 0x0027d, length 82
|  chunk IDAT at offset 0x002db, length 129
|  chunk IDAT at offset 0x00368, length 45
|  chunk IDAT at offset 0x003a1, length 45
|  chunk IDAT at offset 0x003da, length 45
|  chunk IEND at offset 0x00413, length 0
|No errors detected in transp.png (99.7% compression).

That's based on libpng, too (so's POV's PNG code.)  Offhand I'd say it's a 
GIMP bug, or maybe your GIMP is linked against a bad version of libpng.

-- 
Ron Parker   http://www2.fwi.com/~parkerr/traces.html
My opinions.  Mine.  Not anyone else's.

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