Ick. The problem is that ImageBuf only holds one subimage at a time. And, er,
it's a little tricky to write a multi-subimage file with IB's from Python.
That... needs fixing, it's a bit embarrassing that I don't have a simple
answer. I guess it's rare enough that nobody has complained, so I didn't quite
realize how tricky this particular task would be.
MUST this be Python, or can you use oiiotool for this task? (It's got the
multi-subimage workflow down.)
To test this, I tried:
# Make 5 images
oiiotool --frames 1-5 --pattern "checker:color2={FRAME_NUMBER/8}" 1024x1024 3
-d half -o "{FRAME_NUMBER}.exr"
# Staple them together as subimages
oiiotool [1-5].exr --siappendall -o all.exr
# Add text, the -a is crucial to preserve and operate on all subimages
oiiotool -a all.exr --text:x=100:y=100 HELLO -o text.exr
and the resulting text.exr does seem to have the text in all subimages.
Now, I did this with master, and also verified with the current supported
release, 2.1.
Maybe it will work with older, too, but I haven't checked. Release 1.8 is very
old, I wouldn't want to try to figure out what was wrong if it didn't work the
first time. So many things have been fixed and improved since then.
> On Apr 24, 2020, at 8:34 PM, Jake Richards <tru...@blueskystudios.com> wrote:
>
> Hello:
> I apologize if this isn't the forum for asking a question like this, but I
> was attempting to render some text into the first sub image of an exr but it
> appears the ImageBuf will only write out the current sub image. My simple
> code is:
>
> import OpenImageIO as oiio
> ib=oiio.ImageBuf("L.0101.exr")
> oiio.ImageBufAlgo.render_text(ib,100,100,"HELLO",60,"Arial Bold",(1,1,1,1))
> ib.write("hello.exr")
>
> The original exr has 16 sub images but hello.exr has only the 1. What would
> be the best way to get all sub images written out with rendered text? Would
> I have to iterate all the sub images copying their spec/pixels? We are using
> an older version of oiio, 1.8.7 but I might be able to convince them to
> upgrade if this is easier in the master release. Thank you!
>
> Jake
>
> _______________________________________________
> Oiio-dev mailing list
> Oiio-dev@lists.openimageio.org
> http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
--
Larry Gritz
l...@larrygritz.com
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