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Date Posted: 00:33:04 04/04/00 Tue
Author: Steven
Subject: Evaluating Envision Image Library

We are evaluating Envision Image Library for one of our new project. We have this requirement where the user can select an area of the image, apply Gamma transformation on that area.

This can be easily done with Envision using the QuickSelect method like the below:

procedure TEditForm.ImageScrollBoxQuickSelect(
const Sender: TImageScrollBox; const Graphic: TDibGraphic);
var
Transform : TGammaTransform;
GammaStr : String;
Gamma : Double;
begin
if MessageDlg( 'Apply gamma effect ?', mtConfirmation, [mbYes, mbNo], 0) = mrYes then
begin
GammaStr := '1.0';
if not InputQuery('Gamma', 'Gamma value (0.1 - 7.0)', GammaStr) then
Exit;

Gamma := StrToFloat(GammaStr);

FUndoGraphic.Assign(Graphic);
Transform := TGammaTransform.Create;
try
Transform.OnProgress := MainForm.OnProgress;
Transform.Gamma := Gamma;
Transform.ApplyOnDest(FUndoGraphic, Graphic);
finally
Transform.Free;
end;

MainForm.u_FDirty := True;
ImageScrollBox.Redraw(True);
end;
end;

However, we can't do 1 thing. How can we actually put this Gamma"ed" area back on the original selected area? What we want is to allow the user to apply the effect on the area we want.

Please advise. Is it possible to be done using Envision?

Steven,
System Analyst
ACNielsen Systems Asia Pacific.

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