Re: [Openexr-devel] How to write an exr image?

[Florian Kainz]

Patrick wrote:
> Hi All,
>
> I have just installed OpenEXR and trying to understand how to read/write 
> exr files. How do I compile the examples in IlmImfExamples folder? If I 
> type make it says:
>
> make: Nothing to be done for 'all'

You probably didn't run configure with --enable-imfexamples.
(The README file should really explain this.)  You do not
need FLTK to compile and link the examples.

> If it's already compiled, how do I run it?

Compiling the examples produces an executable called "imfexamples".
To run it, cd to IlmImfExamples and type "./imfexamples".

> Also,
> has anyone a sample code that I can simply compile that would write an 
> .exr image? Even a plain black image would be great.

The code in IlmImfExamples does just that.

> I have tried to compile manually the code in the IlmImfExamples folder 
> above but I'm getting lots of errors like the following:
>
> In function `writeRgba1(char const*, Imf::Rgba const*, int, int)':
> : undefined reference to 
> `Imf::RgbaOutputFile::RgbaOutputFile[in-charge](char const*, int, int, 
> Imf::RgbaChannels, float, Imath::Vec2<float>, float, Imf::LineOrder, 
> Imf::Compression)'

"undefined reference to Imf::..." suggests that you forgot to link
your program with the IlmImf library.

> Thanks for you help!
> patrick
>
>
>
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