[PATCH] utils: raspberrypi: ctt: Fix integer division error calculating LSC cell size

[Naushir Patuck]

Hi David,

Thanks for the fix.

On Wed, 7 May 2025 at 16:31, David Plowman
<david.plowman at raspberrypi.com> wrote:
>
> The cell sizes must be cast to integers as the parameters that
> were passed in may be floats.
>
> Bug: https://github.com/raspberrypi/libcamera/issues/260
> Signed-off-by: David Plowman <david.plowman at raspberrypi.com>
> Fixes: 36ba0e551507 ("utils: raspberrypi: ctt: Fix NaNs in lens shading tables")

Reviewed-by: Naushir Patuck <naush at raspberrypi.com>

> ---
>  utils/raspberrypi/ctt/ctt_alsc.py | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/utils/raspberrypi/ctt/ctt_alsc.py b/utils/raspberrypi/ctt/ctt_alsc.py
> index f4fd09e3..5d8b2ced 100644
> --- a/utils/raspberrypi/ctt/ctt_alsc.py
> +++ b/utils/raspberrypi/ctt/ctt_alsc.py
> @@ -131,7 +131,7 @@ def alsc(Cam, Img, do_alsc_colour, plot=False, grid_size=(16, 12), max_gain=8.0)
>      pixels.
>      """
>      w, h = Img.w/2, Img.h/2
> -    dx, dy = (w - 1) // (grid_w - 1), (h - 1) // (grid_h - 1)
> +    dx, dy = int((w - 1) // (grid_w - 1)), int((h - 1) // (grid_h - 1))
>
>      """
>      average the green channels into one
> --
> 2.34.1
>