----- Original Message ----- From: John Francis replying to Jens Bladt > > > > Simple math tels me that 3000 pixel covering 24mm gives 125 pixel/mm. But > > you need three to make a PAIR of lines. > > Sigh. Here we go again. > > You need two pixels (one black, one white) to make a pair of lines > (also one black, one white). So 3000 pixels in 24mm is 62.5 lp/mm. >
Jens, I take it you think of three adjacent sensors in RGB. Before you measure lp/mm, you have to interpolate (Bayer) the data for each pixel with data from the adjacent sensors. John, (or Rob or anyone...) This may be a stupid question, but is the relationship between lp/mm and sensors as straightforward as "two adjacent sensors equal to one line pair, irrespective of sensor colour"? cheers, Jostein
