On 2/28/2026 12:48 PM, Father Horton via Discuss wrote:
The documentation says that the vertical scale goes 1-100 based on the
brightness, but it doesn't say how the horizontal dimensions are
determined. I tried it and it doesn't look like it's quite 1 unit per
pixel. Is it, and my eyes are just deceiving me?
One unit per pixel. However, remember your fenceposts
https://en.wikipedia.org/wiki/Off-by-one_error#Fencepost_error, and
know that the pixels are at the corners of the 1x1 squares, not in the
center.
Thus, for a 10x10 image, the lower-left pixel is at 0,0, and the
upper-right is at 9,9.
Thank you.
On Sat, Feb 28, 2026 at 9:52 PM Jordan Brown <openscad@jordan.maileater.net>
wrote:
> On 2/28/2026 12:48 PM, Father Horton via Discuss wrote:
>
> The documentation says that the vertical scale goes 1-100 based on the
> brightness, but it doesn't say how the horizontal dimensions are
> determined. I tried it and it doesn't look like it's quite 1 unit per
> pixel. Is it, and my eyes are just deceiving me?
>
> One unit per pixel. *However*, remember your fenceposts
> <https://en.wikipedia.org/wiki/Off-by-one_error#Fencepost_error>, and
> know that the pixels are at the corners of the 1x1 squares, not in the
> center.
>
> Thus, for a 10x10 image, the lower-left pixel is at 0,0, and the
> upper-right is at 9,9.
>
>
>
