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Alpha channel image sequence

Posted: Tue, 6th Oct 2009, 1:25pm

Post 1 of 14

leonado2

Force: 1000 | Joined: 4th Oct 2006 | Posts: 45

VisionLab User FXhome Movie Maker

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Before I install the latest version, I just wondered what changes had been made.

Just wondered if the latest version has addressed these issues? If not, is there any point in running the latest upgrade.
Everything else works fine, its a great program. However, my use of it is being limited by these problems and I am having to use other software instead of VL, when i could be using VLab to do most things in one go.

Here is a rundown of what happens.

1. I render an animation in LW9.6 to an image stream. It can be TGA,BMP JPG, tried them all.

2. Next I import, or try to open the stream in Vlab.
First go, no joy, a box pops up stating Director player error, String expected [#Hack:#exit_lock_true] Click OK, then another box, Handler not defined #title.
Then the program locks up.

I can try this 3,4,5 times. Then out of the blue it will decide to load on one attempt.

3. OK, stream loaded, but now whe have an alpha channel that should not be there. For instance, scenerey infront of a starlit sky, becomes scenery infront of black matt aplha.

4. another scenario. rendered out to QT file. Next import into VL. QT file animation totaly black.

I love the program and want to use it more often, but these error just slow me down and I have to fall back on other programs.

Am I the only one getting this problem?
Is there a cure for these problems in Vlab?

Jon.
Posted: Tue, 6th Oct 2009, 1:48pm

Post 2 of 14

Joshua Davies

Force: 25400 | Joined: 21st Mar 2001 | Posts: 3029

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FXhome Team Member

We've had no reports of these problems before. The update mainly fixes a framerate issue with QuickTime. The second problem would be reported all the time by hundreds of users if it were a common one.
Posted: Tue, 6th Oct 2009, 1:51pm

Post 3 of 14

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

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FXhome Team Member

leonado2 wrote:

4. another scenario. rendered out to QT file. Next import into VL. QT file animation totaly black.
Totally black or totally transparent? The former would be a bit odd, but the latter would imply an erroneous alpha channel, as you mention with your image sequences.

Are you sure Lightwave isn't including unwanted alpha info when rendering without you realising?
Posted: Tue, 6th Oct 2009, 2:01pm

Post 4 of 14

leonado2

Force: 1000 | Joined: 4th Oct 2006 | Posts: 45

VisionLab User FXhome Movie Maker

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Tarn wrote:


Totally black or totally transparent? The former would be a bit odd, but the latter would imply an erroneous alpha channel, as you mention with your image sequences.

Are you sure Lightwave isn't including unwanted alpha info when rendering without you realising?
Well, I'm not sure how. When you render out an image stream you have two options. The first states Save RGB and you click on the type.
The next says Save Alpha, and you tick this box if you want an alpha channel.
As I have only ticked the RGB, it should only be RGB. If I import the stream into sony Vegas or another fx program, there is no problem like this. Its only VLab that gives me these problems.

So I can only conclude that Visionlab is the culprit.
Posted: Tue, 6th Oct 2009, 2:11pm

Post 5 of 14

Simon K Jones

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Can you send us a little snippet of the image stream? Just a couple of frames so we can take a look.
Posted: Tue, 6th Oct 2009, 3:17pm

Post 6 of 14

leonado2

Force: 1000 | Joined: 4th Oct 2006 | Posts: 45

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Sure thing, where do I need to upload to?

Jon.
Posted: Tue, 6th Oct 2009, 3:36pm

Post 7 of 14

Joshua Davies

Force: 25400 | Joined: 21st Mar 2001 | Posts: 3029

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How big are the images in the stream? Can you just send a couple to team@fxhome.com?
Posted: Tue, 6th Oct 2009, 3:41pm

Post 8 of 14

leonado2

Force: 1000 | Joined: 4th Oct 2006 | Posts: 45

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OK, Will do.

Thanks

Jon.
Posted: Wed, 7th Oct 2009, 10:04am

Post 9 of 14

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

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Thanks for sending over those images.

All of them have very prominent alpha transparency above the brick wall, presumably where the sky is supposed to be. It's not just VisionLab that detects it - opening it in GIMP shows the transparent area very clearly as well.

So LW must still be including alpha with the images. Are you sure the alpha option you mentioned isn't referring to rendering a separate alpha file?
Posted: Wed, 7th Oct 2009, 10:13am

Post 10 of 14

Joshua Davies

Force: 25400 | Joined: 21st Mar 2001 | Posts: 3029

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Yeah, I can't find a single application which doesn't see the alpha channnels in these TGA images so its no surprise that VisionLab see them as well. I don't really know how it can be the same with JPEG as that format doesn't support alpha channel...
Posted: Wed, 7th Oct 2009, 12:20pm

Post 11 of 14

leonado2

Force: 1000 | Joined: 4th Oct 2006 | Posts: 45

VisionLab User FXhome Movie Maker

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Thats very strange, There shouldn't be an alpha channel as I don't have it ticked on export. I will double check the Jpeg stream again and try that. Maybe I didn't try Jpeg before after all. Its worth a try.

I've been chatting to some other people, and they asked if my FX program had a way of turning off alpha channels. Does Visionlab have a way of doing this after import?

Jon.
Posted: Wed, 7th Oct 2009, 7:08pm

Post 12 of 14

pscamm

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I have also experienced the error condition when trying to start visionlab up with an image sequence

sad

Also, having a checkbox to disable the alpha channel on a particular track on the timeline would be great

smile
Posted: Wed, 7th Oct 2009, 7:11pm

Post 13 of 14

Axeman

Force: 17995 | Joined: 20th Jan 2002 | Posts: 6124

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SuperUser

leonado2 wrote:

I've been chatting to some other people, and they asked if my FX program had a way of turning off alpha channels. Does Visionlab have a way of doing this after import?

Jon.
The VisionLab Toolbar has a channels menu that looks like 4 dots: red, green, blue, and grey. Open the menu and you can select whether alpha channels are displayed or not.
Posted: Wed, 7th Oct 2009, 7:55pm

Post 14 of 14

leonado2

Force: 1000 | Joined: 4th Oct 2006 | Posts: 45

VisionLab User FXhome Movie Maker

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Ive tried that.I set it to RGB only, but it still displayed my images with an alpha.
However, I have found that importing a render stream that was exported in Jpeg format does stop the alpha. As mentioned before Jpeg doesn't support Alpha. Although I'm not sure if Jpeg format would be as detailed for HD image stream.

Jon.