calibration frame?

[FA Limited]

i remember reading somewhere it is good to take a blank photo on the film to use for calibration purposes, but don't really understand why or how this could be done. anyone got any ideas?

thanks

 

[antiquark]

Hmmm, sounds like a myth to me. Wouldn't the gaps between the frames serve the same purpose?

 

[Twigs]

what do you mean by calibration?

 

[FA Limited]

It's important though that you use a calibration negative from the same film, because the colour and density of the orange masking layer will vary from film to film. What may count as a neutral frame for one roll, might well produce blueish results on another. For obvious reasons, the equal density is also important.

http://cameras.alfredklomp.com/scanning/
i've read something like this before on this forum too

 

[ed1k]

Well, gaps between frames or just blank space after last frame could easily serve this very purpose to scan it and measure color/density of the mask. You need this if you only scan colour negative without any processing including conversion to positive and colour/gradation correction, i.e. if you have 16 bit per channel tiff or raw, you add adjust layer in photoshop in order to subtract orange mask.
Ed

 

[hlockwood]

Hmmm, sounds like a myth to me. Wouldn't the gaps between the frames serve the same purpose?

Not if it's in the film strip holder. The gaps are blocked so that no unexposed film is visible.

Harry

 

[FA Limited]

thanks for the responses