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Re: imwrite.m test failures
From: |
Andreas Weber |
Subject: |
Re: imwrite.m test failures |
Date: |
Mon, 07 Oct 2013 11:38:56 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130922 Icedove/17.0.9 |
On 06.10.2013 19:03, marco atzeri wrote:
> Il 10/6/2013 6:52 PM, Andreas Weber ha scritto:
>> Am 03.10.2013 21:46, schrieb marco atzeri:
>>> testing latest devel
>>> (changeset: 17540:b7aa1d726bcc)
>>>
>>> anyone seeing the same ?
>>>
>>>>>>>> processing /pub/hg/octave/scripts/image/imwrite.m
>>> ***** testif HAVE_MAGICK
>>> imw = randi (255, 100, "uint8");
>>> filename = [tmpnam() ".png"];
>>> unwind_protect
>>> imwrite (imw, filename);
>>> imr = imread (filename);
>>> unwind_protect_cleanup
>>> unlink (filename);
>>> end_unwind_protect
>>> assert (imw, imr)
>>> !!!!! test failed
>>> ASSERT errors for: assert (imw,imr)
>>>
>>> Location | Observed | Expected | Reason
>>> (1,1) 104 103 Abs err 1 exceeds tol 0
>>> (2,1) 184 183 Abs err 1 exceeds tol 0
>>> ..
>>> (99,100) 96 95 Abs err 1 exceeds tol 0
>>> (100,100) 126 125 Abs err 1 exceeds tol 0
>>>>>>>> processing /pub/hg/octave/scripts/image/ind2gray.m
>>>
>>>
>>
>> Hi Marco,
>> cset: 0c6750ace8b4, test imwrite.m PASSES 10 out of 10 tests
>>
>> GraphicsMagick 1.3.16 2012-06-23 Q8 http://www.GraphicsMagick.org/
>>
>> MAGICK_CPPFLAGS = -I/usr/include/GraphicsMagick
>> MAGICK_LDFLAGS =
>> MAGICK_LIBS = -lGraphicsMagick++ -lGraphicsMagick
>>
>> Can you try
>> octave> imw = uint8([0 100 200]);
>> octave> imwrite(imw, "testA.png")
>>
>> and then in a shell
>> $ gm identify -verbose testA.png
>>
>> I get:
>> Image: testA.png
>> Format: PNG (Portable Network Graphics)
>> Geometry: 3x1
>> Class: PseudoClass
>> Type: grayscale
>> Depth: 8 bits-per-pixel component
>> Channel Depths:
>> Gray: 6 bits
>> Channel Statistics:
>> Gray:
>> Minimum: 0.00 (0.0000)
>> Maximum: 200.00 (0.7843)
>> Mean: 100.00 (0.3922)
>> Standard Deviation: 100.00 (0.3922)
>> Colors: 256
>> 0: ( 0, 0, 0) black
>> 1: ( 1, 1, 1) #010101
>> ..
>> 100: (100,100,100) #646464
>> ...
>> 200: (200,200,200) #C8C8C8
>> ...
>> 255: (255,255,255) white
>> Filesize: 69
>> Interlace: No
>> Orientation: Unknown
>> Background Color: white
>> Border Color: #DFDFDF
>> Matte Color: #BDBDBD
>> Compose: Over
>> Dispose: Undefined
>> Iterations: 0
>> Compression: Zip
>> Signature:
>> 6f5c5c4f22b887737ef219b11c1e7f94faef02e50d985032538327b2bcd9a2ec
>> Tainted: False
>>
>> Until now it could be a problem with imwrite or imread, perhaps we can
>> assign it to one of them.
>>
>> HTH, Andy
>>
>
> Q16 instead of Q8
> GraphicsMagick 1.3.18 2013-03-10 Q16 http://www.GraphicsMagick.org/
>
> therea are some slight differences in the gray depth
>
> $ gm identify -verbose testA.png
> Image: testA.png
> Format: PNG (Portable Network Graphics)
> Geometry: 3x1
> Class: PseudoClass
> Type: grayscale
> Depth: 8 bits-per-pixel component
> Channel Depths:
> Gray: 8 bits
> Channel Statistics:
> Gray:
> Minimum: 0.00 (0.0000)
> Maximum: 51143.00 (0.7804)
> Mean: 25528.67 (0.3895)
> Standard Deviation: 25571.61 (0.3902)
> Colors: 256
> 0: ( 0, 0, 0) black
> 1: ( 1, 1, 1) #010101
>
> 100: (100,100,100) #646464
>
> 255: (255,255,255) white
> Filesize: 69
> Interlace: No
> Orientation: Unknown
> Background Color: white
> Border Color: #DFDFDF
> Matte Color: #BDBDBD
> Compose: Over
> Dispose: Undefined
> Iterations: 0
> Compression: Zip
> Png:IHDR.color-type-orig: 0
> Png:IHDR.bit-depth-orig: 8
> Signature:
> eaa4e546aa78466f45e563dbcbab6f26d66e96f2485b3e199d7b0e59c5f49775
> Tainted: False
>
>
>
Hi Marco,
I use octave default 36b9fa789d8e
can you try this changeset too? There were some changes to imwrite since
b7aa1d726bcc.
I compiled libgraphicsmagick with Q16:
GraphicsMagick 1.3.16 2012-06-23 Q16 http://www.GraphicsMagick.org/
$ gm identify -verbose testA.png
Image: testA.png
Format: PNG (Portable Network Graphics)
Geometry: 3x1
Class: PseudoClass
Type: grayscale
Depth: 8 bits-per-pixel component
Channel Depths:
Gray: 8 bits
Channel Statistics:
Gray:
Minimum: 0.00 (0.0000)
Maximum: 51400.00 (0.7843)
Mean: 25700.00 (0.3922)
Standard Deviation: 25700.00 (0.3922)
Do you see the different values for Max and Mean?
When I read back the image with imread I get
octave:1> imread("testA.png")
warning: your version of GraphicsMagick limits images to 16 bits per pixel
ans =
0 100 200
So perhaps a problem with the newer gm lib?
Regards Andy