Is it possible to select random pixels?

[APShredder]

The title pretty much says it all. Can you select random pixels from an image? The reason I'm asking is because I'm working on a plugin that dissolves one image onto another. I got it working with a lot of help from Simon Brown, but I'm not really satisfied with the effect it gives. So if it is possible, could you please post an example on what I should do. Thanks in advance.

[Simon Brown]

By "select" do you mean actually modifying the selection, or just selectively using?

[APShredder]

Just selectively using them to lay them over the current image.

[BoltBait]

Here is a good example:

http://www.boltbait.com/pdn/codelab/hel ... seedButton

[APShredder]

Well, I looked at your code example, but I'm not sure if it is of any use to me. I assume the part of the code your talking about was this:

if (RandomNumber.Next(255) > 128)
        {
           CurrentPixel = Amount1;
        }

Maybe I'm just not looking at it right, but what I'm trying to do is select a certain number of pixels randomly from a pre-existing image based on an amount the user put in.

[Simon Brown]

I've modified the code I previously sent you and the pattern seems less predictable now.

http://www.isimonbrown.co.uk/files/Dissolve.zip

[APShredder]

Thanks Simon! That's exactly the effect I was looking for. I have to say, I really appreaciate all the work and effort you've put into plugin. I really feel like I should put you down as a co-author for this plugin.

[Simon Brown]

Just one second thought:

In EffectPlugin.cs:

Find:

public EffectPlugin()
           : base(EffectPlugin.StaticName, EffectPlugin.StaticIcon, EffectPlugin.StaticSubMenuName,
           EffectFlags.Configurable | EffectFlags.SingleThreaded)
       {
           rand = new Random();
       }

Replace with:

public EffectPlugin()
           : base(EffectPlugin.StaticName, EffectPlugin.StaticIcon, EffectPlugin.StaticSubMenuName,
           EffectFlags.Configurable | EffectFlags.SingleThreaded)
       {

       }

Find:

static Random rand;

Replace with:

static Random rand;

       protected override void OnSetRenderInfo(EffectConfigToken parameters, RenderArgs dstArgs, RenderArgs srcArgs)
       {
           rand = new Random();
       }

[APShredder]

OK the changes are all made. And one last thing, would you like me to add you as a co-author when I publish this?

[Simon Brown]

Don't bother.

Edit: Fixed typo.

[APShredder]

Ok, if you're sure.