[Cin] possible alpha bug in processing

[Andrew Randrianasulu]

пн, 21 нояб. 2022 г., 00:38 Phyllis Smith via Cin <
cin at lists.cinelerra-gg.org>:

> Updated BT #558 based on IgorBeghetto's testing and still at least 1
> problem left.
> Sorry about the confusion of the render with PNG, EXR, and TGA which I
> "think" was already working correctly and Andrew confirmed.
>

Actually, it was working for their *color* channels, and alpha channel fix
surprizingly fixed part of BT 558


That is what this thread started out with and somehow morphed into BT 558
> partial fix.
>
>
>
> On Sun, Nov 20, 2022 at 7:51 AM Igor BEGHETTO via Cin <
> cin at lists.cinelerra-gg.org> wrote:
>
>> I have done a build by git 20221117 where I changed line 104 in
>> "virtualvconsole.C"
>> From: vrender->video_out->set_clear_color(clr_color, 0xff);
>> To:   vrender->video_out->set_clear_color(clr_color, 0x00);
>>
>> 1. I opened old projects to see how they behaved. It seems good.
>> 2. I tested Open EDL feature using EDL_Files.zip by RafaMar in
>> (ManrisBT0000558) as a sequence on the top of my project. It seems to
>> work good.
>> 3. Test with Mixer Viewer as shown in Tutorial "Cinelerra GG: Multi Cam
>> editing (with Proxy)" https://www.youtube.com/watch?v=49EExsRsjlY . It
>> seems good.
>>
>> 4. BUT I noticed a problem when the Nested clip with fade In is pasted
>> in the Master project; however, that is there also without the mod.
>> My test file and screenshot in the compressed file to the link
>>
>> https://transfer.sh/vURPjc/Test_AlphaChannelUsingFadeOnNested__Cin_2022117_and_0x00.tar.gz
>>
>> The project uses the same Title effect for the Nested Clip as for the V3
>> Video track. In the timeline there are three markers (labels). When the
>> Insertion Point (the cursor) is pointing on the 2nd marker, the two
>> texts should have the same white colour. Unforunately this does not
>> happen. It is weird, but I think it would be useful to keep this mod.
>> It is possible to have the right behaviour in the Nested clip by
>> changing the "Overaly mode", in the V4 video track, from Normal to
>> PorteDuff...->SrcOver.
>> Finally, I wouldn't close the ticket "0000558: Problem with alpha
>> channel when using a nested or reference EDL"
>> (https://www.cinelerra-gg.org/bugtracker/view.php?id=558) because, in my
>> opinion, it is not completely solved. We could add a note about. Thanks!
>>
>> About "... IgorBeg were able to see that the correction fixes render
>> using PNG, EXR, and TGA", I don't know what you are referring to. I
>> haven't tested anything about. Sorry.
>>
>> IgorBeg
>>
>>
>> Il 19/11/2022 23:29, Phyllis Smith ha scritto:
>> > As IgorBeghetto recommended, I checked into GIT the change of 0xff to
>> > 0x00 in virtualvconsole.C as Andrew provided in his patch "
>> > 0001-background-clear-in-vconsole-must-be-set-to-0.patch". It will be
>> > easy to undo if Igor and his computer, Charlie, find a problem with
>> > it.  (Actually I never figured out how to back something out of GIT, I
>> > just add back the original).
>> >
>> > Good find by Goat and glad Andrea and IgorBeghetto were able to see
>> > that the correction fixes render using PNG, EXR, and TGA.  (I still
>> > wonder what "Goat" stands for?).
>> --
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>> Cin at lists.cinelerra-gg.org
>> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>>
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