RGB vs. sRGB

RGB vs. sRGB Color

This page shows a typical texture map from our standard 3030/RGB scanhead and the new 2K × 2K texture map from a 3030/sRGB scanhead. Additionally, edited files are provided for further evaluation.

sRGB Color Texture Map

Click on image to download the full-resolution TIF
Download sRGB Scan File

RGB Color Texture Map

Click on image to download the full-resolution TIF
Download RGB Scan File

Photo vs. Color Map

Below you'll see a photo of our sRGB model on the left and a screen capture of the rendered model in the Plyview program. Note: The PLY file on the left has been edited to remove the subject's hair..


Photo	UV Mapped PLY File

Edited Files

Filename	Description
hr_srgb_red_edit.zip	Edited PLY file (shaved head) with CPV mapping
hr_srgb_red_hair_v2.zip	Reference PLY file (separate hair) with CPV mapping
hr_srgb_red_surf.zip	SubD/Polygonal surface fitted onto shaved head model
hr_srgb_red_0512.zip	512 × 512 color, normal and displacement maps for SubD/Polygonal surface
hr_srgb_red_1024.zip	1024 × 1024 color, normal and displacement maps for SubD/Polygonal surface
hr_srgb_red_2048.zip	2048 × 2048 color, normal and displacement maps for SubD/Polygonal surface
hr_srgb_red_edit_uv.zip	Edited PLY file (shaved head) with crisper UV mapped color
hr_srgb_red_2048_CUV.zip	Crisper color map for SubD/Polygonal surface

CPV vs. UV

In case you're not sure about the difference between CPV and UV color mapping, here's a summary that applies to cylindrical head scans:

CPV Mapping

This method of mapping the color texture onto the 3D range data is described as "color pixel per vertex". Basically, there is an RBG color value for each XYZ vertex in the geometry. This is the method that Cyberware has used since the scanners were created.

Pros:

Fully supported in PlyEdit.
Handles overlaps in the geometry. For example, color behind the ear can be different from on the front of the ear.
Backwards compatibility with older Cyberware scans.

Cons:

Need 3D paintbox/PlyEdit in order to edit the color map.
Color resolution is limited by the resolution of the geometry, so a decimated mesh will have blurred color.

UV Mapping

There is a UV coordinate for each geometry vertex, which references into texture map file. This method is very efficient for high-resolution color maps and lower-resolution range (3D) data.

Pros:

Can easily edit color in 2D paintbox, such as Photoshop.
Color resolution independent of geometry resolution, so a decimated mesh will have crisp color.

Cons:

Limited support in PlyEdit, but mesh can be edited with CPV initially, then UVs reapplied when complete.
Doesn't handle overlaps in the geometry nicely. For example, color behind the ear is the same as on the front of the ear.