[vtk-developers] PNGWriter now writing out a black background after 17 Oct.

[Andrew Maclean]

I have done a merge request for this, marked as WIP:
https://gitlab.kitware.com/vtk/vtk/merge_requests/2161

Regards
   Andrew


On Fri, Nov 11, 2016 at 5:57 PM, Andrew Maclean <andrew.amaclean at gmail.com>
wrote:

> Hi all ... again.
>  I just tested Ken's suggestion of setting alpha bitplanes to 8 in the
> default settings for vtkRenderWindow and all tests pass as before. On my
> Kubuntu setup I get 1673/1673 tests passing.
>
> With respect to the python test, if I comment out def testWIFRGB(self) in
> Kubuntu I get an image with a transparent background as expected. In
> Kubuntu 16.10 I suspect there is some issue with Plasma when in interactive
> mode as I get a lot of window resets.
>
> So perhaps this is the way to go at this stage, just change line 62 in
> vtkRenderWindow.cxx to:
> this->AlphaBitPlanes = 8;
> and maybe add a test.
>
> I suspect that the only a few linux users may notice something if they
> have inadvertently used vtkWindowToImageFilter.SetInputBufferTypeToRGBA()
> when they meant to use vtkWindowToImageFilter.SetInputBufferTypeToRGB() .
>
> What do people think?
>
> If everyone is pressed for time, I could probably do something on Monday
> as my weekend starts tomorrow.
>
> Regards
>    Andrew
>
>
> On Fri, Nov 11, 2016 at 12:06 PM, Andrew Maclean <
> andrew.amaclean at gmail.com> wrote:
>
>> Hi All,
>>
>> I had to switch the display manager back to lightdm (in order to log into
>> Ubuntu). Look at what I get when running either Kubuntu or Ubuntu.
>>
>> For both Kubuntu and Ubuntu, for the TestWIFPNGRGBA_*.png files, I would
>> have expected a 1/4 sphere with a transparent background. Instead Kubuntu
>> has a transparent background with a few pixels that are not transparent,
>> whilst Ubuntu has a 1/4 sphere with a non-transparent background.
>>
>> I have a GTX980 card and the OpenGL version is 4.5.0 NVIDIA 367.57
>>
>>
>> On Fri, Nov 11, 2016 at 7:11 AM, Andrew Maclean <
>> andrew.amaclean at gmail.com> wrote:
>>
>>> David,
>>>
>>> What you are seeing in the Mac is what I see in Windows and what I would
>>> expect.
>>>
>>> On Kubuntu 16.10 I get the attached RGBA image - trasnparent with a few
>>> scattered pixels.
>>>
>>> if I comment out def testWIFRGB(self): in the code, I get an RGBA with a
>>> blue background (I expected a transparent one). In other words it's the
>>> same as the RGB image. Interestingly, when I was running Unbuntu I got this
>>> image instead of the Kubuntu version.
>>>
>>> Attached is the output from running the program in Kubuntu 16.10.
>>>
>>> Andrew
>>>
>>> On Fri, Nov 11, 2016 at 1:24 AM, David E DeMarle <
>>> dave.demarle at kitware.com> wrote:
>>>
>>>> In the RGBA version the blue background _should_ be invisible. The
>>>> question in my mind is why doesn't your Linux build not show anything in
>>>> the foreground? Can you share the png's made by your ubuntu build?
>>>>
>>>> On my Mac for example, for both GL1 and GL2, RGB has a blue background,
>>>> RGBA's is transparent.
>>>> That is expected. The image contents are the same at every pixel except
>>>> that the RGBA'a alpha channel has value 255 for foreground and 0 for
>>>> background pixels.
>>>>
>>>>
>>>> David E DeMarle
>>>> Kitware, Inc.
>>>> R&D Engineer
>>>> 21 Corporate Drive
>>>> Clifton Park, NY 12065-8662
>>>> Phone: 518-881-4909
>>>>
>>>> On Wed, Nov 9, 2016 at 5:18 PM, Andrew Maclean <
>>>> andrew.amaclean at gmail.com> wrote:
>>>>
>>>>> Hi Guys,
>>>>>    For me this still appears to be the case. Try running the attached
>>>>> test code.
>>>>> In Windows and Linux, TestWIFPNGRGB.png are the same.
>>>>> In Windows TestWIFPNGRGBA.png has a transparent background, whilst in
>>>>> KUbuntu no image is produced just a transparent background.
>>>>>   Are you able to replicate this behaviour?
>>>>>
>>>>> Andrew
>>>>>
>>>>> On Wed, Nov 9, 2016 at 10:22 PM, David E DeMarle <
>>>>> dave.demarle at kitware.com> wrote:
>>>>>
>>>>>> Andrew, does this still appear to be the case in the 7.1 release
>>>>>> branch? If so mind filing a quick issue on gitlab with the 7.1 milestone
>>>>>> tag?
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> ___________________________________________
>>>>> Andrew J. P. Maclean
>>>>>
>>>>> ___________________________________________
>>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>> ___________________________________________
>>> Andrew J. P. Maclean
>>>
>>> ___________________________________________
>>>
>>
>>
>>
>> --
>> ___________________________________________
>> Andrew J. P. Maclean
>>
>> ___________________________________________
>>
>
>
>
> --
> ___________________________________________
> Andrew J. P. Maclean
>
> ___________________________________________
>



-- 
___________________________________________
Andrew J. P. Maclean

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