David Kay wrote: > I really can't see your logic here Thomas. > Underexposure with any bit depth device lowers all values by however many > f-stops you underexpose. Therefore, this has the effect of nudging the > lowest values off the scale where they FALL below the threshold of the > device! The device stores all data before processing linearly. As you know, > the unprocessed image looks anything but "photographic," until properly > toned. > > When you make exposures with a digital back, photons or light energy, are > converted to electrons or electrical energy, PROPORTIONATE to the intensity > of the light! Therefore there IS a relationship to exposure in f-stops!
David, you can choose to trust me or not, I'll end my part of this discussion with a couple of lines quoted from Bruce Fraser's: Real world Photoshop, and then I'm out of it - I have a seminar next week to prepare to, so currently I don't have time for these mind games... "Dynamic range is an Analogue limitation of the sensor. However a wider dynamic range requires more bits to describe it adequately, producing smooth tonal gradations". If you want to know EXACTLY what's going on you should befriend an engineer building digital backs and/or get hold of a book called "Colour engineering, Achieving device independent colour". Edited by Phil Green and Lindsay MacDonald. You'll likely have to brush up on your math skills for both though <G>. Best Regards, Thomas Holm / Pixl Aps - Photographer, Educator, Colour Management Consultant & Seminar speaker - Remote Profiling Service (Output ICC profiles) - www.pixl.dk � Email: th[AT]pixl.dk -- =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
