Is there discrepancy on official TouchGFX documentation about 8 bpp color depth support?

[BParh.1]

So according to this

https://support.touchgfx.com/docs/basic-concepts/framebuffer#colors

the TouchGFX can only support 16, 24 or 32 bpp color depth (apart from grayscale). But in here https://support.touchgfx.com/docs/basic-concepts/color-formats#color-depth

it says that it actually support 6 bpp colors depth.

So can TouchGFX actually support color depth lower than 16 bpp color depth (not grayscale) ? Does it support 8 bpp or 6 bpp? For 6 bpp, why I cannot see this option available on TouchGFX Designer option (see snippet below)

Also, in TouchGFX 'COLOR DEPTH; options, it list as well 1, 2, 4, and 8 bit depth, do they refer to grayscale color or the colors?

 

[MM..1]

When you ask on STM LTDC, then i test and have work 24 16 and L8 . First two is RGB pixel based, L8 is pallete based over CLUT, that is ARGB32 256 table pallete.

From TouchGFX side, that is only 8bit memory graphics and you can choice ARGB2222 ABGR2222 and more simmilar combination.

When you use other interface and method to transfer to LCD you can use 1 2 4 bit .