https://bugs.kde.org/show_bug.cgi?id=512809

--- Comment #2 from Milan Zamazal <[email protected]> ---
(In reply to Maik Qualmann from comment #1)
> Oh, this will be difficult to understand how Pentax handles it.

I don't think it's that difficult.

> I'm not clear on what you photographed; it seems to be a screen with the
> focus points. Did you draw the focus points?

It's a computer screen. I put the camera on a tripod, displayed the focus
points in the viewfinder, and drew their positions on the screen while looking
through the viewfinder. It's inaccurate but I suppose the pattern is more or
less regular, so it should be possible to extract
some reasonable coordinates from it.

> Pentax only uses a numbering system from 1 to about 33, no coordinates, and
> we don't know how they number them.

They are numbered 1-33 from top left to right and then down. That is:

  1 2 3  4  5
 6 7 8 9 10 11 12
13 14 15 16 17 18 19 20 21
 22 23 24 25 26 27 28
  29 30 31 32 33

> The reference implementation shows that a distinction must also be made
> between phase and contrast focus.

Yes. The examples above are for phase focus.

The contrast detection pattern consists of a grid of 7x5 rectangles that covers
most, but not whole, of the image area. Here are some examples:

http://data.zamazal.org/digikam/_K1_6906.JPG ... the central rectangle selected
as the focus area and in focus
http://data.zamazal.org/digikam/_K1_6907.JPG ... the top left rectangle
selected as the focus area and in focus
http://data.zamazal.org/digikam/_K1_6909.JPG ... the bottom right rectangle
selected as the focus area and in focus
http://data.zamazal.org/digikam/_K1_6908.JPG ... the whole focusable area
selected and the 2nd and 3rd rectangles from left in the first (top) row and
from the second row are in focus

I can see some focus area coordinates in exiftool output but not the points in
focus. They must be stored somewhere, the camera reports them.

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