Way to get a pixel colour from an image

[joesmaller_xyz (joesmaller)]

As a developer, it is near impossible to get the pixel RGB colour from an image, without using external methods.

If this feature were to be added, I would be able to use the upcoming StudioService:PromptImportLocalAsset() alongside it for my heightmap importer plugin. I would get the colour value of each pixel within the image and use that, removing the need for an external program to convert the heightmap and texture map images into something Studio can read.

It would be nice to have something as seen in this post:

Is there a way to get rgb colors from an image?

A simple GetPixel(x,y) function for decals would also be useful for generating terrain from height and material map decals. Currently you need to either use HTTPService, or an external program (e.g. python script) to write out your bitmap as a lua array you can paste into a script. It would definitely be a time saver to be able to sample pixels off of an image in /content.

If the feature was something similar to the quote above, I could run a simple for loop to get each pixel colour within the image. I would also be able to get the image size (Provided the function returns nil if the pixel did not exit), although another feature request for that would probably be better.

[Kampfkarren (boyned)]

It would help if you provided a use case.

[joesmaller_xyz (joesmaller)]

Is this alright?

@ITBV

If the feature was something similar to the quote above, I could run a simple for loop to get each pixel colour within the image. I would also be able to get the image size (Provided the function returns nil if the pixel did not exit), although another feature request for that would probably be better.

[Kampfkarren (boyned)]

This sounds like an XY problem–wouldn’t the solution in that case be an API for getting image size?

[joesmaller_xyz (joesmaller)]

That was more of an example, I’m not suggesting that currently as the main reason for this feature request. This is primarily for getting the colour of an image.

[Scriptos]

I’m working on a space game, which is currently using textures wrapped on spheres for the planets. It’d be incredibly useful if I could do a little bit of math to check where the cursor aligns with the sphere, convert that to a Vector2 value or something, and then check the RGB colour at that point on the image in order to see if the player was hovering their mouse over blue-ish colour (aka; ocean), in order to prevent buildings from being placed on top of oceans.

Edit: I just realized that I’m in the reference post, where I gave the exact same example. Whoops.

[XAXA]

There’s also LocalAsset:GetFileContentsBinary(), which returns a string. It’s cumbersome, but you can probably try decoding it yourself. ~~I found a png decoder written in pure lua 5.1, and it’s licensed in BSD-2 (not copyleft): https://github.com/kartik-s/lua-png~~ Doesn’t work on compressed pngs, which is what you’ll work with 99% percent of the time

[Fm_Trick (Trick)]

I would love to have a way to get a pixel colour from a image. I would use this to determine the average or most common colour of an image, to use in procedurally generating colour-specific particle, beam, and lighting effects.

[Intended_Pun]

On that note, this feature would make my request for the new Lua game page possible:

Introducing the New Lua Game Details Page

I like it except for one thing: Can the background be something besides this plain white Roblox logo? It looks really bad in my opinion. It’d be extremely cool if the background changed colors depending on the thumbnail of the place. Kind of like how Spotify changes depending on the album art: [image] [image] If somebody made a mock-up of that and posted it here I think that would be really cool. It’d also make the website feel a lot more immersive

So this feature would help drastically with Roblox’s push for a completely Lua mobile interface that looks and feels good

[Ghosteined (Ghost_Developer)]

Currently making exactly that with editable images, it’s ABSOLUTELY not optimized but i don’t have the choice
EDIT: forgot to check the date maybe i’m a LITTLE bit late

[joesmaller_xyz (joesmaller)]

EditableImages resolve this specific issue, though they may be cumbersome for some cases.

[Ghosteined (Ghost_Developer)]

The problem is that you can’t make editable images if it’s not your images

[joesmaller_xyz (joesmaller)]

That’s outside the scope of this specific feature request, you’d be better off adding a reply to a different one that’s related to image asset ownership.

[Ghosteined (Ghost_Developer)]

No i mean i can’t get a specific pixel colour from an image with editable images because i can’t make editable images out of any image, but it’s still useful.