Chromatic Surface

asked 2017-12-12 08:19:08 -0600

eshirima
1206 ●6 ●20 https://github.com/esh...

updated 2017-12-13 07:39:55 -0600

I am working on a project that involves removing highlight areas of an image. I stumbled on the paper; Real-time Specular Highlight Removal Using Bilateral Filtering, which has shown some promising results. For it to work though, they require

the input images have chromatic surfaces

My questions are:

What is a chromatic surface? Taking a guess from the input images shown in the paper, they all share a dark background. Is this what a chromatic surface is? Just an image with a dark background? Does the object have to be up-close?
Given your standard BGR input image, is it possible to convert it to the required standard i.e. chromatic surface? If yes, how?

The second question might sound stupid but that is because I have zero knowledge of what a chromatic surface is in the first place. Any guidance will be greatly appreciated.

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Comments

I have no clue what a chromatic surface is. Perhaps you could write to the author: n-ahuja[at]illinois[dot]edu

I also posted the question "what is a chromatic surface?" to gamedev.net.

sjhalayka ( 2017-12-12 09:40:37 -0600 )edit

@sjhalayka Appreciate it mate! I will reach out to the author and update should I hear back. It would be awesome as well if u could directly link the question from gamedev

eshirima ( 2017-12-12 10:16:50 -0600 )edit

@eshrima Yep, I put the link to here in the question on gamedev.net. :)

sjhalayka ( 2017-12-12 10:18:12 -0600 )edit

The current link takes me to the homepage and not the exact question on gamedev. Found it! Here's the question on gamedev

eshirima ( 2017-12-12 10:21:08 -0600 )edit

Oh sorry, this is the direct link: https://www.gamedev.net/forums/topic/...

sjhalayka ( 2017-12-12 10:23:43 -0600 )edit

Did you read what Scouting Ninja wrote? I have no idea what they mean, but it looks like an answer.

sjhalayka ( 2017-12-12 13:21:54 -0600 )edit

I just did. I understood the explanation. You can go ahead and quote their response as an answer to my question. I'll mark it as the answer

eshirima ( 2017-12-12 14:01:39 -0600 )edit

Thanks very much.

sjhalayka ( 2017-12-12 14:17:37 -0600 )edit

@berak What is the rule for spamming accounts? Take a look at that one ^^

eshirima ( 2017-12-12 15:16:58 -0600 )edit

@eshirima -- "full-on", i'd say, thanks again for the notice !

berak ( 2017-12-12 15:23:17 -0600 )edit

see more comments

answered 2017-12-12 14:13:51 -0600

sjhalayka

1170 ●4 ●18

updated 2017-12-12 21:16:07 -0600

Thanks to Scouting Ninja on gamedev.net for answering the question: https://www.gamedev.net/forums/topic/...

Does anyone know what a chromatic surface is?

Yes, almost all artist that finished there material stage should know.

First a chromatic surface is a surface that has the same properties as Chromium. This is that they refract light without separating the specular light.

What that means is unlike gold that tints all reflections, some reflections keep there original color. So chromatic surfaces keeps a lot of white light from the sun and lights, resulting in a brighter contrast than with normal metals.

So a surface with lots of contrast. A chromatic effect filter will remove bright spots created by chromatic surfaces or colors that is in high contrast with other colors.

That original paper talks about chromatic hue. The most common chromatic hue is often the inverted color.

image description

This image shows a good chromatic hue. See on the right is the chromatic effect of the colors.The last scale is the one with the least chromatic effect and is the most natural for none metal materials.

To simplify it you can say chromatic means contrast.(Maybe it's a Latin name for contrast, who knows?)

This is all part of color theory

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