Jump to content

Negating a Color Filter


Recommended Posts

This is probably a really simple fix, but I'm still a beginner at photo manipulation.

 

If I have a picture that is partly distorted by a color filter, is there any way I can negate the color distortion?

 

For example, if I had a picture like this:

 

colorfilter.jpg

 

where I can use the sky or grass or bricks as reference points, how would I cancel out the color and make the whole picture look normal?

 

Link to comment
Share on other sites

It sounds like a simple problem, but it's a lot harder than you might think.

The problem is that, when the color filter was used, the color in the original image was "replaced" with the color chosen for the filter. There isn't, programmatically, a way to know what the original color was.

 

what I do all summer Emote Cursor Pack 'noob gallery

No, Paint.NET is not spyware...but, installing it is an IQ test. ~BoltBait

Blend modes are like the filling in your sandwich. It's the filling that can change your experience of the sandwich. ~Ego Eram Reputo

Link to comment
Share on other sites

That's true, but you can assume that the color filter is consistant, right? So could you, pick a small patch of sky next to where the filter overlaps. The sky color is fairly consistant, so then you would have what the true color is, and what the color looks like under the filter. Is there any way to use that to figure out the color of the filter by itself, then somehow remove that from the image?

Link to comment
Share on other sites

The change wasn't uniform over the entire image. Otherwise, it would be a simple hue change and you would have a variety of colors in the filtered section. The filter made the image black and white, and used the color as "gray". That means there is no way to know for sure what the colors were previously. The only thing you know from a programming standpoint is the brightness.

In short, undoing the filter cannot be done with a simple click of a button. You'll have to figure out some way to do it manually.

 

what I do all summer Emote Cursor Pack 'noob gallery

No, Paint.NET is not spyware...but, installing it is an IQ test. ~BoltBait

Blend modes are like the filling in your sandwich. It's the filling that can change your experience of the sandwich. ~Ego Eram Reputo

Link to comment
Share on other sites

Very roughly:

I saved panel two as a separate image so I could use its palette later on with this plugin: Color Match

Then I desaturated the image to (very roughly) equalize the color information.

Finally I applied the palette from panel two image n order to get this:

yhsjjie-117.png

You can see that the image is only very slightly colored. It's going to take a significant amount of work to get it looking acceptable.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...