07-21-2007, 07:16 AM
Join Date: May 2004
| | Re: Lighting Spectrum
Originally Posted by ruki
My first problem is taking decent photos. I used a 1:1 lens in my Digital Rebel, but getting the exposure correct is not easy for me.
My Coolpix 4500 have a supermacro-mode making it fairly easy to take a good picture - but I would really like to modify the lens in my QuickCam3000 to be able to shoot good pictures from the project star spectrometer since I have removed the IR-filter from it. That would make the spectral distribution accurate over 650 nm.
It isn't obvious what you are doing once you have a properly exposed picture. Are you taking intensity levels via Photoshop and then feeding that to a plotting program?
I cut out the 400-700 nm part of the spectrum-picture from the Project STAR, reverse it to make the blue part on the left, desaturates it, and then I scale it down to 1x400 pixels and makes an "auto levels".
Then I input this 1x400 pixel picture into a Java-program I've made which extracts the RGB-values and paints a B&W-distribution where black in the original picture is a bar with height 0 and white (255,255,255) is a bar with height 255.