Most of the users of MTF Mapper cannot print big test charts and are
limited to A4 or A3 size, which is OK for perspective charts but rather
small for the grid/lensgrid charts.
It would be great if you could generate multipage charts, that could be
printed in smaller format and carefully mounted (for example using double
sided tape) to a flat board.
I made myself a set of such charts by cropping the “old” grid chart. The
result is adapted to my printer, but may not work on others with different
unprinted margin).
The new lensgrid chart cannot be easily split because of its tilt.
I think that the chart ideally suited to be divided is the chart made of 24
x 36 trapezoids described in the article you published with Bernard Delley
in Applied Optics. In fact this chart could be printed in 2x2, 3x3, 4x4,
6x6 and 12x12 sheets! After small adaptation perhaps even with using
standard "print poster" settings instead of splitting the file physically.
Hmm. I have actually tried this before with 2 A4 prints of a modified lensgrid chart. Although this produced perfectly usable SFR measurements I found that it was too hard to align them accurately enough for the chart orientation feature to work (you actually need sub 0.1 mm accuracy).
But I know Bernhard often uses multi-page prints (those are his chart designs). I'll ask him if he would mind if I include his charts with MTF Mapper. You would lose the chart orientation feature, though.
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Hi Frans,
Most of the users of MTF Mapper cannot print big test charts and are
limited to A4 or A3 size, which is OK for perspective charts but rather
small for the grid/lensgrid charts.
It would be great if you could generate multipage charts, that could be
printed in smaller format and carefully mounted (for example using double
sided tape) to a flat board.
I made myself a set of such charts by cropping the “old” grid chart. The
result is adapted to my printer, but may not work on others with different
unprinted margin).
The new lensgrid chart cannot be easily split because of its tilt.
I think that the chart ideally suited to be divided is the chart made of 24
x 36 trapezoids described in the article you published with Bernard Delley
in Applied Optics. In fact this chart could be printed in 2x2, 3x3, 4x4,
6x6 and 12x12 sheets! After small adaptation perhaps even with using
standard "print poster" settings instead of splitting the file physically.
Thank you for your excellent program.
Regards
Jerry
Hmm. I have actually tried this before with 2 A4 prints of a modified lensgrid chart. Although this produced perfectly usable SFR measurements I found that it was too hard to align them accurately enough for the chart orientation feature to work (you actually need sub 0.1 mm accuracy).
But I know Bernhard often uses multi-page prints (those are his chart designs). I'll ask him if he would mind if I include his charts with MTF Mapper. You would lose the chart orientation feature, though.
Thank you very much, that would be great!