Primary Color Difference to Alpha

Enormator · **Posted:** Sun Aug 19, 2007 12:23 pm

It calculates for every pixel the difference between the pixel and the primary color. The more they are equal, the more alpha will rest. Just duplicate your layer, do my effect with a Primary color selected, maybe some fine tuning with Curves+ alpha channel and there you go affecting only this specially colored part of the image without need of feathering or anything because it's always a smooth gradient from layer to change to the original image layer.

Download here:

Attachment:

File comment: Effect DLL in a ZIP file

EffectDLL.zip [2.45 KiB]
Downloaded 4482 times

Unzip it into your Effects directory in the Paint.NET folder.
It will be listed under Effects -> Color

example:

1 to 2: Here i first chose the sky's color as primary with the Color Picker :ColorPicker:

then I ran my effect.
2 to 3: After that I did some alpha fine tuning with Curves+ :Curves:

. And the only color effect I added to the sky was increasing saturation and a little hue adjustment :HueSaturation:

.
3 to 4: I put the original image as a layer under the modified one.

Link to where you get Curves+

code (Codelab):

Code:

int dr,dg,db;

void Render(Surface dst, Surface src, Rectangle rect)
{
    PdnRegion selectionRegion = EnvironmentParameters.GetSelection(src.Bounds);

    // Delete any of these lines you don't need
    Rectangle selection = this.EnvironmentParameters.GetSelection(src.Bounds).GetBoundsInt();

    ColorBgra PrimaryColor = (ColorBgra)EnvironmentParameters.PrimaryColor;

    ColorBgra CurrentPixel;
    for(int y = rect.Top; y < rect.Bottom; y++)
    {
        for (int x = rect.Left; x < rect.Right; x++)
        {
            if (selectionRegion.IsVisible(x, y))
            {
                CurrentPixel = src[x,y];
                dr = CurrentPixel.R - PrimaryColor.R;
                dg = CurrentPixel.G - PrimaryColor.G;
                db = CurrentPixel.B - PrimaryColor.B;
                if (dr < 0)
                 dr=-dr;
                if (dg < 0)
                 dg=-dg;
                if (db < 0)
                 db=-db;
                CurrentPixel.A = (byte)(255-((dr+dg+db)/3));
                dst[x,y] = CurrentPixel;
            }
        }
    }
}

I'm currently searching for a good 16x16 png icon. Please tell me your ideas.

Bob · **Posted:** Sun Aug 19, 2007 12:41 pm

Hmm...

WOOT! It's Curves+ alpha tweaking made simple, in some sort.

lestat2000_vamp · **Posted:** Sun Aug 19, 2007 3:37 pm

thanks look nice tuts.....!!!

Aron · **Posted:** Sun Aug 19, 2007 4:38 pm

i have been waiting for this a long time

Ash · **Posted:** Sun Aug 19, 2007 4:55 pm

lestat2000_vamp wrote:

thanks look nice tuts.....!!!

What

You keep saying nice tuts in plugin section?

The_Lionhearted · **Posted:** Sun Aug 19, 2007 11:05 pm

I'm a little confused...where would I want to use something like this? Enormator, could you explain the use for your plugin?

Enormator · **Posted:** Mon Aug 20, 2007 8:51 am

You can use it always when you want to edit a picture. Use instead of a selection to get a better gradient without feathering.
You are the artist. I just wrote this plugin to use it for my self and because I'm a nice guy, I posted it here.
For creativity, ask god

davidtayhs · **Joined:** Wed Jun 28, 2006 3:36 am **Posts:** 183

What settings did you use for the plugins?

The_Lionhearted · **Posted:** Mon Aug 20, 2007 8:30 pm

Enormator wrote:

You can use it always when you want to edit a picture. Use instead of a selection to get a better gradient without feathering.
You are the artist. I just wrote this plugin to use it for my self and because I'm a nice guy, I posted it here.
For creativity, ask god

Thanks for answering Enormator. I'll give it a shot!

blooper101 · **Joined:** Fri Feb 09, 2007 2:47 am **Posts:** 138

It looks like it makes the image more vivid to me.
I likey!
[E to the d-it]Whoops, nevermind, I just read right after the pictures. My bad.
Asking god for creativity :oops:

RECON04 · **Posted:** Tue Aug 21, 2007 10:12 am

maybe he means toots
like hey toots hows your day ? lol
anyways nice plugin imma go try it out now

davidtayhs · **Joined:** Wed Jun 28, 2006 3:36 am **Posts:** 183

Hi Enormator,

I really don't know how you managed to use the curves+ plugin to change your second picture into the third with bleached buildings against a blue sky!

Must be more than just fine adjustments with curves and little fine-tuning with hues!!!

Enormator · **Posted:** Fri Aug 24, 2007 7:26 pm

Please note, that all the effects were made on top layer. At the end I set the original layer under the changed layer to visible again.

davidtayhs · **Joined:** Wed Jun 28, 2006 3:36 am **Posts:** 183

Hi Enormator!

I'll take the risk of revealing my ignorance by telling you that I don't know how to change the second picture to the third, nor the third to the fourth in the example that you gave!!

Wonder if you could explain the steps but if it's too bothersome, it's alright.

Enormator · **Posted:** Sat Aug 25, 2007 10:27 am

No of course it's not to bothersome

It's always good, when people ask because I tend to explain in a quite ununderstandable way.

EDIT: I redid the explanation of the example in first post. Is it understandable now? Please ask because I can't see your thoughts. :wink:

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