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Please help me make a custom 8x3 crop grid

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Please help me make a custom 8x3 crop grid
« on: 08 / January / 2023, 11:05:23 »
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Hello! I'm new to CHDK and I'm loving it, but I can't figure out how to make my own 8x3 grid for my G1X. The wiki post says I have to format it to a 3x2 (360x240) format but the CHDK Preview Tool is in a completely different ratio and it's really confusing the heck out of me, and I have no idea whether or not the math I'm using to calculate the numbers is correct or not.
If someone can help me out with this I'd greatly appreciate it.  :D

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Offline reyalp

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Re: Please help me make a custom 8x3 crop grid
« Reply #1 on: 08 / January / 2023, 15:03:03 »
The wiki article is probably out of date. In Dec 2020 (r5663), grid drawing was changed to support screen sizes other than 360x240. This change would be in 1.6 and later, not in 1.5. The commit comment says "Support for cameras that do not have 360x240 bitmap screens. Grid is scaled and centred on the screen with grid aspect ratio kept at 4:3."

G1 X is probably not 360x240, but I'm not sure offhand what it is. Note the original cams were 360x240, but still 4:3 aspect ratio, meaning non-square pixels.

I'd suggest trying something simple, like a 360x240 box divided in quarters, and see how it shows up.

There should be a thread where this change was discussed in more detail, but it wasn't linked in the commit and I didn't find it in a quick search.
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