Hi everyone
finally I got a densitometer (printalyzer from Derek) now I must use it!!
I’ve read a lot on how to make a characteristic curve but there’s something I miss. I don’t have the knowledge to calculate a CI or an average gamma but I wold like to find a method that could work for me in finding the right developing time.
My idea is testing my film shooting a target (a white wall) at increment of 1/2 stop, from -5 to +5. In 20 exposure I should have 20 frames to sample with the densitometer. Now, is correct my assumption that I don’t need to measure the light in millilux because I know that every frame is a half of a stop so when I drow the x axis I mark each dot as an half of a stop. The y axis is calibrated whit the LogD from 0 to 3. Then I start the measurement of the frame starting from the -5 and writing the corresponding value on the x axis of the first exposure at the level of the density indicated by the densitometer. Doing so I can draw a line connection all the points and that should be the HD curve.
is that correct? If is the case, I’d like to make different curves with different developing times to understand how my process should be at a given SBR.
Please be patient with me, forgive my English, I hope someone can understand.
Have a good day
finally I got a densitometer (printalyzer from Derek) now I must use it!!
I’ve read a lot on how to make a characteristic curve but there’s something I miss. I don’t have the knowledge to calculate a CI or an average gamma but I wold like to find a method that could work for me in finding the right developing time.
My idea is testing my film shooting a target (a white wall) at increment of 1/2 stop, from -5 to +5. In 20 exposure I should have 20 frames to sample with the densitometer. Now, is correct my assumption that I don’t need to measure the light in millilux because I know that every frame is a half of a stop so when I drow the x axis I mark each dot as an half of a stop. The y axis is calibrated whit the LogD from 0 to 3. Then I start the measurement of the frame starting from the -5 and writing the corresponding value on the x axis of the first exposure at the level of the density indicated by the densitometer. Doing so I can draw a line connection all the points and that should be the HD curve.
is that correct? If is the case, I’d like to make different curves with different developing times to understand how my process should be at a given SBR.
Please be patient with me, forgive my English, I hope someone can understand.
Have a good day
