Not a dumb question at all. You can't see the RGB values in APG. You have to load them in software that can first, read 32 bit float images. Then, second, has a color picker that will show you the floating point RGB values. Another way to confirm it would be to load the image in Photoshop and just bring the brightness down on the .exr or .hdr file and see if you reveal any image details hiding in the overexposed areas.
I have attached some images. I am using output from PTGUI loaded in Nuke (http://www.thefoundry.co.uk/products/nuke/
) because PTGUI actually outputs float values above 1.0, unlike APG. Note the RGB values outside the window above 5, even though my (and your) monitor can only display up to 1!THAT
Dynamic Range Imagery.
From the HDR shop website, http://www.hdrshop.com
"WHAT IS A HIGH-DYNAMIC RANGE (HDR) IMAGE?
"The "dynamic range" of a scene is the contast ratio between its brightest and darkest parts. A plate of evenly-lit mashed potatoes outside on a cloudy day is low-dynamic range. The interior of an ornate cathedral with light streaming in through its stained-glass windows is high dynamic range. In fact, any scene in which the light sources can be seen directly is high dynamic range.
"A High-Dynamic Range image is an image that has a greater dynamic range than can be shown on a standard display device, or that can be captured with a standard camera with just a single exposure.
"HDR images also have the important property that their pixel values are proportional to the amount of light in the world corresponding to that pixel, unlike most regular images whose pixel values are nonlinearly encoded.
"HDR Images are typically generated by combining multiple normal images of the same scene taken with different intensity levels, or as the result of creating a global illumination rendering. In practice, high dynamic range pixels use floating-point numbers, capable of representing light quantities of one to a million and beyond. Low-dynamic range images usually represent pixels using eight bits per channel, with pixel values ranging as integers between 0 and 255."
As I have been saying, you can actually have a LDR image saved in a HDR wrapper where the RGB values only go from 0 to clamped at 1. And that is NOT
HDR. Does that make sense?