#252 warnings when running tuxpaint from a graphical terminal.

[tim]

running tuxpaint (sdl1) from an xterm/kterminal etc. gives 5 libpng warnings.

libpng warning: iCCP: too many profiles
libpng warning: bKGD: invalid gray level
libpng warning: bKGD: invalid gray level
libpng warning: bKGD: invalid gray level
libpng warning: bKGD: invalid gray level

tuxpaint appears to run ok.
running the sdl2 version gives the same warning messages above plus an additional 7 copies of...
libpng warning: Interface handling should be turned on when using png_read_image
again, tuxpaint itself appears to run ok.
the (system) version of libpng is 1.6.37

[tim]

woops. correction. in the above report please swap sdl1 and sdl2

[William Kendrick]

This has been going on forever. I'm not sure whether there's a way to ask SDL_image library to report anything back, to help us track down the files. I'm guessing the best solution would be a small test program that uses libpng to open files, and run find . -name "*.png" -exec ... or something to exercise every single PNG file.

[William Kendrick]

Created test-png tool to do this, seems to find files :)

kendrick@gambit:~/tuxpaint/tuxpaint$ ./test-png `find . -name "*.png"` |grep -B 2 "libpng" 
  157 ------------------------------------------------------------------
./starters/jigsaw.png
libpng warning: sRGB: out of place
--
  303 ------------------------------------------------------------------
./data/brushes/heart.png
libpng warning: iCCP: too many profiles
--
  319 ------------------------------------------------------------------
./data/brushes/square_24.png
libpng warning: bKGD: invalid gray level
--
  333 ------------------------------------------------------------------
./data/brushes/square_36.png
libpng warning: bKGD: invalid gray level
--
  340 ------------------------------------------------------------------
./data/brushes/square_12.png
libpng warning: bKGD: invalid gray level
--
  343 ------------------------------------------------------------------
./data/brushes/square_06.png
libpng warning: bKGD: invalid gray level

https://sourceforge.net/p/tuxpaint/tuxpaint/ci/06fafcb6d698f5b891514924292589ddcfdaa796/

[William Kendrick]

Some remaining warnings:

libpng warning: Interlace handling should be turned on when using png_read_image
libpng warning: Interlace handling should be turned on when using png_read_image
libpng warning: Interlace handling should be turned on when using png_read_image
libpng warning: Interlace handling should be turned on when using png_read_image

Otherwise, pngout'ing files helped with the other warnings.

See https://sourceforge.net/p/tuxpaint/tuxpaint/ci/f56acbe34de2143b3cf6720514194c0e93d9f724/

[tim]

many thanks.
regards, Tim

On 04/07/2022 03:55, William Kendrick wrote:

• status: open --> closed
• Comment:

Amusingly, Tux Paint itself (via its call to |png_set_IHDR()| in
|do_png_save()|) saves PNGs as interlaced, so when they are loaded,
the "Interlace handling..." is echoed to STDERR.

Not going to change that (for now), but will close this since all of
the other STDERR-spamming culprit files that ship /with/ Tux Paint
have been adjusted. (See
https://sourceforge.net/p/tuxpaint/tuxpaint/ci/11ca37c8b494573e7ad68a4a6fe467b8c3f7ab64/)

---

[bugs:#252] https://sourceforge.net/p/tuxpaint/bugs/252/ warnings
when running tuxpaint from a graphical terminal.

Status: closed
Group: v0.9.28
Created: Thu Jun 30, 2022 10:13 AM UTC by tim
Last Updated: Mon Jul 04, 2022 12:47 AM UTC
Owner: nobody

running tuxpaint (sdl1) from an xterm/kterminal etc. gives 5 libpng
warnings.

|libpng warning: iCCP: too many profiles libpng warning: bKGD: invalid
gray level libpng warning: bKGD: invalid gray level libpng warning:
bKGD: invalid gray level libpng warning: bKGD: invalid gray level |

tuxpaint appears to run ok.
running the sdl2 version gives the same warning messages above plus an
additional 7 copies of...
|libpng warning: Interface handling should be turned on when using
png_read_image|
again, tuxpaint itself appears to run ok.
the (system) version of libpng is 1.6.37

---

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[William Kendrick]

Amusingly, Tux Paint itself (via its call to png_set_IHDR() in do_png_save()) saves PNGs as interlaced, so when they are loaded, the "Interlace handling..." is echoed to STDERR.

Not going to change that (for now), but will close this since all of the other STDERR-spamming culprit files that ship with Tux Paint have been adjusted. (See https://sourceforge.net/p/tuxpaint/tuxpaint/ci/11ca37c8b494573e7ad68a4a6fe467b8c3f7ab64/)