![]() ![]() Complete TFTP Server example, using Indy components.Meaning of message 'Internal Error SY424'.How to implement custom button captions in a Messa.When to use the OnCreate, OnShow, OnActivate, and.A TDBImage component that reads and writes *.jpg i.Black-Box Miscellaneous Functions and Procedures.How to use the dgMultiSelect option in a TDBGrid.Make a new DBLookupComboBox-Component with OnChang.How to use a TControlCanvas in a component.Create a thread-safe wrapper class for TCustomIniF.Create and Manage dynamic Forms at Runtime using C.Gray := (BitsTo.rgbtBlue + BitsTo.rgbtGreen + BitsTo.rgbtRed) div 3 Procedure GrayscaleRect(Graphic: TBitmap R: TRect) RGBCol := (Trunc(Math.Mean([GetRValue(RGBCol), GetGValue(RGBCol), SrcLine := pRGBArray(Integer(SrcLine) + SrcGap) Lum := Round(SrcLine.rgbtRed * 0.3 + SrcLine.rgbtGreen * 0.59 + SrcGap := Integer(Src.ScanLine) - Integer(SrcLine) ![]() The procedure as written will only work for 32-bit bitmaps, but it can easily be adjusted to 24-bit bitmaps by removing the Reserved member of the TPixelRec record type, and adjusting the Assert() call. Or you could force some color components to 0 or $FF. If you just want to remove the red and green components, or the green and blue components, or the red and blue components, then you can modify this procedure by commenting out one or more of the P.* := Gray lines in the for-loop. Procedure ConvertBitmapToGrayscale(const Bitmap: TBitmap) If SetDIBColorTable(Canvas.Handle, Low(Table), High(Table), Table) = 0 then Procedure TForm1.Button1Click(Sender: TObject) īmp.Width := īmp.Height := īmp.Canvas.Draw(0, 0, ) įunction CreateGreyScaleBmp(Source: TBitmap): TBitmap TRGBArray = array of TRGBTriple Ĭolr := HiByte(sl.rgbtRed * 77 + sl.rgbtGreen * 151 + sl.rgbtBlue * 28) Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, It also has integer math to help speed it up: Here's a greyscale routine that uses a 24-bit bitmap and scanline. How to convert a truecolor bitmap to greyscale ![]()
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