Luminance image with ISO line and image definition

Hello all,

I’m trying to obtain an luminance image with ISO line values over it.

If I use the Honeybee_FalseColor comand I can obtain the ISOline using a toggle on Countour lines. The ISOlines will appear but the image become too exposed (white).

If I adjust the exposure of the image it will be fine but the ISOlines will lose brightness.

These is a way to obtain this without using photoshop?

Another question. There is a way to increase the DPI definition of an image I get from an Image Based Simulation?

I’m attaching some images.

Thank you all for the attention,


Can you post the HDR image that you get after the simulation ? It might be possible to do this without photoshop.

Hello Sarith,

Here there are the HDR image files.

unnamed_IMG_interno.HDR (415 KB)
unnamed_IMG_interno@fc.HDR (209 KB)

Hi Alessandro,

See the images below. The idea is to run the analysis on the original image and then overlay the results of that analysis on an image with lower exposure.Hi Alessandro, I was able to make this work but not in Honeybee. Let’s wait for Mostapha or Chris to reply on this.

Secondly, the DPI/resolution of the image can be improved by setting higher values for imageWidth and imageHeight in analysisRecipe.

@Mostapha/Chris: Falsecolor2 doesn’t seem to support overlaying contours on a different image as per The way that I made this work was to use the that ships with Radiance. However, making that work with honeybee would require Perl to be installed. Do you guys currently require Perl as a dependency? Or maybe, there is a much simpler workaround than what I am suggesting !

Hi Sarith,

Thank you very much for your reply :slight_smile:

It’s possible to know in which way you made this work? Which software did you use?

Thank you again,


Hi Alessandro,

I used Radiance to process your image.

Assuming that we start with the file that you posted,

the steps are:

  1. Reduce the exposure of the original image and save it as a different file.

pfilt -e -2 unnamed_IMG_interno.HDR > unnamed_IMG_interno_filt.hdr

2.Use the original image and filtered image together in falsecolor. Falsecolor will do the analysis on the original image but overlay the results from the analysis on the filtered image.

falsecolor -cl -i unnamed_IMG_interno.hdr -p unnamed_IMG_interno_filt.hdr > unnamed_IMG_interno_contours.hdr

The issue is that falsecolor doesn’t exist in the windows installation of Radiance as a .exe binary file. It exists as a .pl perl file. So, you’d have to have perl installed on your computer and added to your PATH variable to make this thing work smoothly. This is what I know/think anyway.

Thank you so much for your explanation!


I just gave it another try and you can follow the same process in Honeybee to adjust the exposure and then generate the FalseColor image.

Thank you Mostapha!

I think this way is quite easier! :slight_smile:


I didn’t notice till now that Honeybee had a script to set exposure for HDR. I agree, this is much simpler.