[pdftex] graphic{s,x} PNG + pdflatex bug

[George N. White III]

On Thu, May 6, 2010 at 3:55 PM, Jim Diamond <Jim.Diamond at acadiau.ca> wrote:

> On Thu, May  6, 2010 at 15:36 (-0300), George N. White III wrote:
>
>> On Thu, May 6, 2010 at 2:33 PM, Taco Hoekwater <taco at elvenkind.com> wrote:
>>> Nico Schlömer wrote:
>
>>>> Hi all,
>
>>>> I experienced a weird bug using \includegraphics of the graphicx
>>>> package with pdflatex 1.40.10.
>
>>>> I try to load the attached PNG file, and unlike with other PNG files,
>>>> pdflatex would just bail out with
>
>>>> ==================== *snip* ====================
>>>> [...]
>>>> [Loading MPS to PDF converter (version 2006.09.02).]
>>>> )
>>>> ! Dimension too large.
>>>> <argument> \wd \@tempboxa
>>>> l.7 \includegraphics{img1.png}
>>>> ?
>>>> ==================== *snap* ====================
>
>>>> David Carlisle, maintainer of graphicx, suggests that may be a bug in
>>>> pdflatex -- What do you reckon?
>
>>> Well, this png specifies a resolution of 0.9906 pixel per inch so it
>>> has natural sizes of about 252 inch (6.4m). So in my opinion something
>>> *is* wrong with the png.
>
>>> Best wishes,
>>> Taco
>
>> $ identify -verbose img1.png |head
>> Image: img1.png
>> Format: PNG (Portable Network Graphics)
>> Class: DirectClass
>> Geometry: 250x250+0+0
>> Resolution: 0.39x0.39
>> Print size: 641.026x641.026
>> Units: PixelsPerCentimeter
>
>> I loaded the PNG in Adobe Photoshop and saved it as  img2.png:
>
>> $ identify -verbose img2.png |head
>> Image: img2.png
>> Format: PNG (Portable Network Graphics)
>> Class: DirectClass
>> Geometry: 250x250+0+0
>> Resolution: 0.39x0.39
>> Print size: 641.026x641.026
>> Units: PixelsPerCentimeter
>
>> $ pngcheck -vt img1.png
>> File: img1.png (92868 bytes)
>> chunk IHDR at offset 0x0000c, length 13
>>     250 x 250 image, 32-bit RGB+alpha, non-interlaced
>> chunk sBIT at offset 0x00025, length 4
>> red = 8 = 0x08, green = 8 = 0x08, blue = 8 = 0x08, alpha = 8 = 0x08
>> chunk pHYs at offset 0x00035, length 9: 39x39 pixels/meter (1 dpi)
>> chunk IDAT at offset 0x0004a, length 8192
>> zlib: deflated, 32K window, default compression
>> chunk IDAT at offset 0x02056, length 8192
>> chunk IDAT at offset 0x04062, length 8192
>> chunk IDAT at offset 0x0606e, length 8192
>> chunk IDAT at offset 0x0807a, length 8192
>> chunk IDAT at offset 0x0a086, length 8192
>> chunk IDAT at offset 0x0c092, length 8192
>> chunk IDAT at offset 0x0e09e, length 8192
>> chunk IDAT at offset 0x100aa, length 8192
>> chunk IDAT at offset 0x120b6, length 8192
>> chunk IDAT at offset 0x140c2, length 8192
>> chunk IDAT at offset 0x160ce, length 2530
>> chunk IEND at offset 0x16abc, length 0
>> No errors detected in img1.png (16 chunks, 62.9% compression).
>> $ pngcheck -vt img2.png
>> File: img2.png (92076 bytes)
>> chunk IHDR at offset 0x0000c, length 13
>>     250 x 250 image, 32-bit RGB+alpha, non-interlaced
>> chunk bKGD at offset 0x00025, length 6
>> red = 0x00ff, green = 0x00ff, blue = 0x00ff
>> chunk pHYs at offset 0x00037, length 9: 39x39 pixels/meter (1 dpi)
>> chunk vpAg at offset 0x0004c, length 9
>> unknown private, ancillary, safe-to-copy chunk
>> chunk IDAT at offset 0x00061, length 32768
>> zlib: deflated, 32K window, maximum compression
>> chunk IDAT at offset 0x0806d, length 32768
>> chunk IDAT at offset 0x10079, length 26301
>> chunk tEXt at offset 0x16742, length 37, keyword: create-date
>>     2010-05-06T12:39:23-03:00
>> chunk tEXt at offset 0x16773, length 37, keyword: modify-date
>>     2010-05-06T12:35:33-03:00
>> chunk IEND at offset 0x167a4, length 0
>> No errors detected in img2.png (10 chunks, 63.2% compression).
>
>> Both versions look the same using Imagemagick's display,
>> but img2.png does not give the error, so image size does
>> not explain the error.
>
> Did you compare the rest of the output of "identify -verbose" ?  There
> may be something illuminating there.  As your pngcheck output shows,
> the photoshop version is quite a bit different.

I did, but it doesn't seem helpful:

$ diff img1.ident img2.ident
1c1
< Image: img1.png
---
> Image: img2.png
310c310
<   Background color: white
---
>   Background color: rgba(0,0,0,1)
321,322c321,324
<     date:create: 2010-05-06T12:39:23-03:00
<     date:modify: 2010-05-06T12:35:33-03:00
---
>     create-date: 2010-05-06T12:39:23-03:00
>     date:create: 2010-05-06T12:50:09-03:00
>     date:modify: 2010-05-06T12:50:09-03:00
>     modify-date: 2010-05-06T12:35:33-03:00
327c329
<   Filesize: 92.9KB
---
>   Filesize: 92.1KB




-- 
George N. White III <aa056 at chebucto.ns.ca>
Head of St. Margarets Bay, Nova Scotia