does srgb to irradiance function inversely?

[Jackson334-prog]

I tried to write the irradiance of the projector to bitmap Using mitsuba Write into bitmap function. And I just use this bitmap As another projectors irradiance bitmap, But it seems like This irradiance is not equal to The original. So I wonder how can I Take use of it unlossness. I know that There must be some function of srgb to irriadiance But when I write it into bitmap Does this function inversely? Could you give me some advice about it?

[Speierers]

Hi @ljijjiang1234 ,

First of all you need to be careful, writing to an image file using the Bitmap.write() might apply some tonemapping which is probably not desired in your case. For this I suppose you take a closer look at the how-to-guide on image manipulation in Mitsuba 3.

Moreover, when disabling the tonemapping, make sure to export to an EXR file in order to preserve the values above 1.0 in your image (e.g. HDR).

M