The result is saved in PNG to keep the alpha layer.
You are free to improve it (encryption key etc...)
EnJoY
Code: Select all
; =====================================================
;
; Simple STEGANO WATERMARKER
; by Ar-S // PB 6.00 x64
; https://ldvmultimedia.com
; 2022/07/09
; Free to use
;
; Only ASCII Chars avalaible
; ======================================================
Structure Car
min.c
maj.c
EndStructure
UsePNGImageDecoder()
UseJPEGImageDecoder()
UsePNGImageEncoder()
Declare.l pixel_3car(pixel)
Global NewList mot.car()
Global Fichier$
Global LONG
Global C
Global COUL.q
Procedure.l CatchPixel(pixel)
R=Red(pixel)
g=Green(pixel)
b=Blue(pixel)
a=Alpha(pixel)
If a - mot()\min > a -mot()\maj
a = mot()\maj
Else
a = mot()\min
EndIf
pixel=RGBA(R,G,B,a)
ProcedureReturn pixel
EndProcedure
Word$ = InputRequester("Watermark","Enter your signature","")
LONG = Len(Word$)
If LONG > 0
position = 1
For i = 1 To LONG
Lettre$ = Mid(Word$,position,1)
AddElement(mot())
mot()\min = Asc(LCase(Lettre$))
Mot()\maj = Asc(UCase(Lettre$))
position +1
Next
Else
MessageRequester("Error","You have to enter a word.. This program will end",#PB_MessageRequester_Error)
End
EndIf
IMAGE$ = ""
Filtre$ = "Image PNG/JPG/TIFF/TGA|*.tga;*.tiff;*.png;*.jpg"
Filtre = 0
Fichier$ = OpenFileRequester("Choose a picture", FichierParDefaut$, Filtre$, Filtre)
If Fichier$ = ""
End
EndIf
If LoadImage(0,Fichier$)
L = ImageWidth(0) - LONG
H = ImageHeight(0)-1
CreateImage(1, ImageWidth(0), ImageHeight(0), 32, $FFFFFF)
StartDrawing(ImageOutput(1))
DrawingMode(#PB_2DDrawing_AllChannels )
DrawAlphaImage(ImageID(0),0,0,255)
FreeImage(0)
POS = L
;-1st Pixel where we indicate the length of the watermark
LNGPIX = Point(0,0)
; We write the length
Plot(0,0,RGBA(Red(LNGPIX),Green(LNGPIX),Blue(LNGPIX),LONG))
ForEach mot()
COUL = Point(POS,H)
Debug "RGBA = " + Str(Red(COUL))+","+ Str(Green(COUL))+","+ Str(Blue(COUL))+","+ Str(Alpha(COUL))
Plot (POS,H, CatchPixel(COUL))
POS+1
Next
StopDrawing()
DS$ = GetPathPart(Fichier$)
FS$ = GetFilePart(Fichier$,#PB_FileSystem_NoExtension)
Debug DS$+FS$+".png"
SaveImage(1,DS$+FS$+"_signed.png",#PB_ImagePlugin_PNG,0,32 )
FreeImage(1)
;-// CHECKING RESULT //////////////////////////////////////
If LoadImage(0,DS$+FS$+"_signed.png")
StartDrawing(ImageOutput(0))
DrawingMode(#PB_2DDrawing_AlphaChannel)
LONG = Alpha(Point(0,0))
L = ImageWidth(0) - LONG
H = ImageHeight(0)-1
POS = L
For i = 1 To LONG
Debug Chr(Alpha(Point(POS,H)))
POS+1
Next
StopDrawing()
EndIf
EndIf
