Failed to Load Image

[sagarwaghmare69]

Trying to run 'th waifu2x.lua'.
Following is the error log

All packages update to date. Using Lua5.2 instead of luajit.
Also tried with different images as well, same error.

waifu2x.lua:43: failed to load image: images/miku_small.png
stack traceback:
[C]: in function 'error'
waifu2x.lua:43: in function 'convert_image'
waifu2x.lua:291: in function 'waifu2x'
waifu2x.lua:296: in main chunk
[C]: in function 'dofile'
...mare/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:150: in main chunk
[C]: in ?

Kind regards

[nagadomi]

It seems that libpng or graphicsmagick (native or lua wrapper) failed to load a PNG image.
I am not sure why cannot load PNG on your runtime env.

[sagarwaghmare69]

Thanks for your response. I couldnt resolve it. graphicsmagick and libpng are functional and I am using them. I might revisit this in future. Any plans for using torch image package or graphicsmagick directly instead of file io ?

[nagadomi]

Try remove this pcall.

waifu2x/lib/image_loader.lua

Line 116 in 81a4de1

local state, ret = pcall(load_image)

-   local state, ret = pcall(load_image)
+  local ret = load_image()
+  local state = true

What a error is occurring?
Can not read binary file correctly with fp = io.open(file, "rb"), fp:read("*a") in Lua5.2?

waifu2x is strongly dependent on graphicsmagick package(I sent a lot of PR to graphicsmagick), and RPC server requires a function that decoding the image from the blob. so I have no plans to change that code.

[nagadomi]

I fixed io.read option(*a ->*all)
780e22c

[nagadomi]

Now I reinstalled Torch with lua5.2.

/home/nagadomi/torch/install/bin/lua: unable to convert argument 1 from cdata<double> to cdata<intptr_t>
stack traceback:
	[C]: in function 'tonumber'
	...omi/torch/install/share/lua/5.2/graphicsmagick/Image.lua:631: in function 'colorspace'
	lib/image_loader.lua:86: in function 'load_image'

That error is caused by FFI type mismatch in graphicsmagick.
I will investigate this error and try to fix graphicsmagick.

[nagadomi]

Fixed some issues on lua 5.2 eb3926b .
and I have sent PR to graphicsmagick to fix the above issue clementfarabet/graphicsmagick#46.

waifu2x.lua, convert_data.lua, train.lua works on lua 5.2 but web.lua does not work on lua 5.2 because turbo only supports luajit 2.

[sagarwaghmare69]

Nice. @nagadomi thank you. I will try it soon.

[nagadomi]

PR has merged. After updating graphicsmagick, it probably works.

luarocks install graphicsmagick

[sagarwaghmare69]

Thank you

…

On Thu, Mar 2, 2017 at 6:34 PM, nagadomi ***@***.***> wrote: PR has merged. After updating graphicsmagick, it probably works. luarocks install graphicsmagick — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#174 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ADR7VT6B4tbiuSBYNwEIBjnRMBrP5ejhks5rh1IigaJpZM4MKnq6> .

-- Kind regards Sagar M Waghmare

[houguanqun]

I think I meet the same question ,could you help me ?

[JCBrouwer]

I also still run into this problem.

Often times it helps to just run

mogrify filename

But even that doesn't work sometimes.

It's especially weird as it seems to be deterministic which files don't work (running a script multiple times will always see the same files fail) even though in my case all the files were generated by another program in exactly the same way!

The first image gives:

~/torch/install/bin/luajit: waifu2x.lua:45: failed to load image: /Volumes/HDD/Pictures/image-sets/fluid-painting-pix/A/train/fluidpaint512-13.png
stack traceback:
[C]: in function 'error'
waifu2x.lua:45: in function 'convert_image'
waifu2x.lua:296: in function 'waifu2x'
waifu2x.lua:301: in main chunk
[C]: in function 'dofile'
...hans/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:150: in main chunk
[C]: at 0x010daf6a10

While the second upscales just fine (both running with just '-noise_level 3 -tta 1').

[nagadomi]

Both images worked in my environment. Perhaps it is the difference in graphicsmagick version or libpng version.

% gm -help       
GraphicsMagick 1.3.23 2015-11-07 Q16 http://www.GraphicsMagick.org/
Copyright (C) 2002-2015 GraphicsMagick Group.
Additional copyrights and licenses apply to this software.
See http://www.GraphicsMagick.org/www/Copyright.html for details.

% gm convert -list format | grep PNG
      PNG P  rw-  Portable Network Graphics (libpng 1.2.54, zlib 1.2.8)
            See http://www.libpng.org/ for information on PNG..
    PNG00 P  rw-  PNG that inherits type and depth from original (libpng 1.2.54, zlib 1.2.8)
    PNG24 P  rw-  24-bit RGB PNG, opaque only (libpng 1.2.54, zlib 1.2.8)
    PNG32 P  rw-  32-bit RGBA PNG, semitransparency OK (libpng 1.2.54, zlib 1.2.8)
    PNG48 P  rw-  opaque or binary transparent 48-bit RGB (libpng 1.2.54, zlib 1.2.8)
    PNG64 P  rw-  opaque or transparent 64-bit RGBA (libpng 1.2.54, zlib 1.2.8)
     PNG8 P  rw-  8-bit indexed PNG, binary transparency only (libpng 1.2.54, zlib 1.2.8)

The difference between the two images is that the first image has ICC profile.
You can check the format difference with the following command.

% identify -verbose <image_path>

waifu2x uses GraphicsMagick, not ImageMagick. So you can try gm mogirfy instead of mogrify to fix the image.

[nagadomi]

Is liblcms2(which is color management system library that is used for reading ICC profile) linked to graphicsmagick?

% gm version|grep cms
  LIBS     = -ljbig -lwebp -llcms2 -ltiff -lfreetype -ljasper -ljpeg -lpng12 -lwmflite -lXext -lSM -lICE -lX11 -llzma -lbz2 -lxml2 -lz -lm -lgomp -lpthread