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I am embarrassed to ask: white backgrounds and .PNG export

SylvanSylvan Posts: 2,718
edited December 1969 in The Commons

I read on threads that I should be able to render a white background in Luxus, instead of the black.
After a lot of fiddeling I just use a plain cyclorama base, but that is some hassle with shadows and such...
So how can I make a rewnder with a plain white background?
(and I don't mean in the viewport, but in the render itself)

Furthermore, I read everywhere that when I render a .PNG I should not have a background when I import in Gimp.
Guess what: I just get the black background so I have to manually delete the background afterall.

I feel these are some pretty basic things and I am almost embarrassed to ask, but I just can't get my head around this ><</p>

Comments

  • whispers65whispers65 Posts: 952
    edited November 2013

    Sorry if I am mis-reading this. Is the screenshots what you mean? I changed the background color and then rendered and it seemed to be fine.

    *edit* whoops I see "in Luxus". My bad. I have a headache and can't see straight this morning.

    Post edited by whispers65 on
  • scorpioscorpio Posts: 8,471
    edited December 1969

    There's a setting in the Luxus GUI that creates the PNG without a background. I'm rendering at the moment so can't look to see what it is exactly, I think it mentions Alpha.

  • LeatherGryphonLeatherGryphon Posts: 11,651
    edited November 2013

    Estroyer said:
    I read on threads that I should be able to render a white background in Luxus, instead of the black.
    After a lot of fiddeling I just use a plain cyclorama base, but that is some hassle with shadows and such...
    So how can I make a rewnder with a plain white background?
    (and I don't mean in the viewport, but in the render itself)

    Furthermore, I read everywhere that when I render a .PNG I should not have a background when I import in Gimp.
    Guess what: I just get the black background so I have to manually delete the background afterall.

    I feel these are some pretty basic things and I am almost embarrassed to ask, but I just can't get my head around this ><<br />

    PNG background have always been confusing. Different applications seem to have different ideas about what is proper, white, black, or transparent. Also, different applications have different level of control over the number and type of background options. I don't have Luxus so I can't duplicate your situation.

    I understand about the problems using a cyclorama background (shadows, uneven lighting, etc). Perhaps you could try putting a large flat primitive plane way in the background where it doesn't intercept shadows. Then to get it to show up you could select the surface of the plane, turn off reflections and specularity, and crank up the "Ambient" setting to make it visible even if not lit by the lights. Not a perfect solution but it might work in some situations.

    Post edited by LeatherGryphon on
  • scorpioscorpio Posts: 8,471
    edited November 2013

    You need to have the setting Pre Multiple Alpha - ON

    Captureluxus_copy.jpg
    516 x 558 - 86K
    Post edited by scorpio on
  • SylvanSylvan Posts: 2,718
    edited December 1969

    *bows*
    Thank you so much!

  • LeatherGryphonLeatherGryphon Posts: 11,651
    edited December 1969

    scorpio64dragon said:
    You need to have the setting Pre Multiple Alpha - ON

    Ooh! So that's what that's for. Cool!

  • none01ohonenone01ohone Posts: 862
    edited November 2013

    Or select Alpha from the GUI, prior to saving the Tonemapped. Don't forget to switch it back off when not required.
    I've used Alpha to enable me to combine a Luxrender and 3Delight as layers in Gimp. Providing you don't alter the camera settings and position.

    Alpha.png
    712 x 565 - 166K
    Post edited by none01ohone on
  • Miss BMiss B Posts: 3,071
    edited December 1969

    scorpio64dragon said:
    There's a setting in the Luxus GUI that creates the PNG without a background. I'm rendering at the moment so can't look to see what it is exactly, I think it mentions Alpha.

    Blender does the same thing, and I'm not using Cycles to render. I always assumed that saving/exporting a render in PNG format would give me a blank background when I opened it i Photoshop, but no, there is a setting to render in PNG in BW, RGB or RGBA, the last being the one that sets the Alpha channel (transparency). Live and learn.

    I don't remember if the old Blender 2.4x versions had that, but it's certainly been present in the 2.6x versions, and probably was in the 2.5x versions as well.

  • SylvanSylvan Posts: 2,718
    edited December 1969

    Thanks! This was all very enlightening.

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