How to apply filters on a selected area?

we use a code similar to Main sample about operations with filters. This is the code we use for Buttonize effect:

Dim but As New Buttonize

but.BorderWidth = BorderWidth 'for example 10

but.Direction = Direction.Up

but.FadeType = FadeType.Linear

ApplyTransform(but)

After this, the image(the whole area of image) gets the effect. When we first select an area of the image with select tool, and after we apply the effect, the effect applies again to the whole image and not only on the selected area.

What do we have to change so the filter applies only to the selected area ?

cpav

File Attachment(s):

applyFilterToAreaSample.zip (99kb) downloaded 3 time(s).

The way to choose depends on the specific of your task. Using masked transforms is more common way while the crop-apply-and-copy-back way may be faster in some cases.

I recommend you to use the first and try the former only in case of any issues.

Edited by user Tuesday, October 28, 2008 7:11:49 AM(UTC)  | Reason: Not specified

I have some problem here with your sample - Texturize transform is not descendant of the MaskedBitmapTransform class, so it is impossible to use it with custom masks.

However, I decided that it is a good chance to demonstrate another way - "crop-transform-draw". Here is method which applies texturize transform only to the selected part of the image:

Private Sub Button3_Click(ByVal sender As System.Object, 
	ByVal e As System.EventArgs) Handles Button3.Click

	If (bitmapViewerMainView.Bitmap.IsEmpty Or 
		rectangleRubberbandSelect.Rectangle.Width < 1 Or 
		rectangleRubberbandSelect.Rectangle.Height < 1) Then
		Return
	End If

	' 1) We need to extract specified part of the bitmap 
	Dim roi As New Aurigma.GraphicsMill.Bitmap()
	Dim cropTransform As New Aurigma.GraphicsMill.Transforms.Crop()
	cropTransform.Rectangle = rectangleRubberbandSelect.Rectangle
	cropTransform.ApplyTransform(bitmapViewerMainView.Bitmap, roi)

	' 2) Now we should apply texturize transform to this region
	roi.Transforms.Texturize(3, 3)

	' 3) And put this patch back to the original image
	roi.Draw(bitmapViewerMainView.Bitmap, 
		rectangleRubberbandSelect.Rectangle,
		Aurigma.GraphicsMill.Transforms.CombineMode.Copy, 
		1.0, 
		Aurigma.GraphicsMill.Transforms.InterpolationMode.HighSpeed)

End Sub

As for code sample with MaskedTransforms - you can use one from the Overlaying Images article, "Masked Transforms" section. If you need any other specific sample - feel free to ask!

Edited by user Wednesday, October 29, 2008 1:58:40 PM(UTC)  | Reason: Not specified

Are you sure that "UndoRedoEnabled" property of the bitmap is set to true? I attached your sample with my modifications to this post.

Please, could you check it and let me know if you have any problems with Undo/Redo in your enviroment.

File Attachment(s):

filterSample.zip (17kb) downloaded 3 time(s).

Solarize transform was classified in another way. Along with Leves, HistogramEqualize, Brightness/Contrast and similar transforms it was placed into "ColorAdjustment" helper, so you should write such line:

roi.ColorAdjustment.Solarize()

Yeah, I know that it is a little unexpected in the first time ;)