Victor Image Processing Library How-to Tips

Text with Drop Shadow on a Background

• Load the background image
• Create the shadow in a new image
• Create the text in another new image
• Combine the shadow with the background
• Combine the text with the background

Background

Text Shadow

Result

Text with Drop Shadow on a Background - the Visual Basic Source Code

' ........... The function ...........
Private Sub mnutext_with_shadow_on_background_Click()
   Dim tmptext As imgdes
   Dim tmpshadow As imgdes
   Dim resimg As imgdes
   Dim rcode, captionHt, captionWd, txtStartY As Long
   Dim caption As String
   Dim count As Long
   
   Dim filename As String
   Dim jinfo As JpegData
   Dim bpp As Long
   Dim transcolor As Long
   
   filename = "backgrnd.jpg"
   transcolor = 255
   
   rcode = jpeginfo(filename, jinfo)
   If (rcode = NO_ERROR) Then
      rcode = allocimage(resimg, jinfo.width, jinfo.length, jinfo.vbitcount)
      If (rcode = NO_ERROR) Then
         rcode = loadjpg(filename, resimg)
         If (rcode <> NO_ERROR) Then ' Problem loading the background image
            freeimage resimg
            Return
         End If
      End If
    End If
   
   bpp = jinfo.vbitcount
   caption = "River"
   
   ' Create the shadow in tmpshadow
   rcode = allocimage(tmpshadow, 176, 86, bpp)
   If (rcode = NO_ERROR) Then
      rcode = zeroimage(255, tmpshadow)
   End If

   tmpshadow.stx = 7		   ' Offset the shadow by (7, 7)
   tmpshadow.sty = 7
   rcode = addtext(808080h, 48, "ARIAL BOLD", caption, tmpshadow)
   rcode = gaussianblur(15, tmpshadow, tmpshadow) ' Make the shadow fuzzy
   tmpshadow.stx = 0
   tmpshadow.sty = 0
   ' Shadow is in tmpshadow, save it so you can examine it later
   rcode = savejpg("tmpshadow.jpg", tmpshadow, 75)

    Create the text in tmptext 
   rcode = allocimage(tmptext, 176, 86, bpp)
   If (rcode = NO_ERROR) Then
      rcode = zeroimage(255, tmptext)
   End If
   
   rcode = addtext(&h808080, 48, "ARIAL BOLD", caption, tmptext)
   ' Text is in tmptext, save it so you can examine it later
   rcode = savejpg("tmptext.jpg", tmptext, 75)

   ' Put shadow on the background
   rcode = multiplyimage(resimg, tmpshadow, resimg)
   If (rcode = NO_ERROR) Then
      ' Put text over the shadow on the background
      rcode = multiplyimage(resimg, tmptext, resimg)
   End If

   rcode = savejpg("new.jpg", resimg, 75) ' Save the result

   freeimage tmptext
   freeimage tmpshadow
   freeimage resimg
End Sub

Text with Drop Shadow on a Background - the C/C++ Code

int text_with_shadow_on_background(void)
{
   imgdes tmptext;
   imgdes tmpshadow;
   imgdes resimg;
   int rcode = NO_ERROR, captionHt, captionWd, txtStartY;
   char *caption="River";

   char *filename = "backgrnd.jpg";
   JpegData jinfo;
   int bpp;

   rcode = jpeginfo(filename, &jinfo);
   if(rcode == NO_ERROR) {
      rcode = allocimage(&resimg, jinfo.width, jinfo.length, jinfo.vbitcount);
      if(rcode == NO_ERROR) {
         rcode = loadjpg(filename, &resimg);
         if(rcode != NO_ERROR) {  // Problem loading the background image
            freeimage(&resimg);
            return(rcode);        // Return error code
            }
         }
      }

   bpp = jinfo.vbitcount;

   // Create the shadow in tmpshadow
   rcode = allocimage(&tmpshadow,176, 86, bpp);
   if(rcode == NO_ERROR) 
      zeroimage(255, &tmpshadow);

   tmpshadow.stx = 7;		   // Offset the shadow by (7, 7)
   tmpshadow.sty = 7;
   rcode = addtext(0x808080, 48, "ARIAL BOLD", caption, &tmptext);
   gaussianblur(15, &tmpshadow, &tmpshadow); 
   // Shadow is in tmpshadow, save it so you can examine it later
   tmpshadow.stx = 0;		   // Restore origin
   tmpshadow.sty = 0;
   rcode = savejpg("tmpshadow.jpg", &tmpshadow, 75);


   // Create the text in tmptext
   rcode = allocimage(&tmptext, 176, 86, bpp);
   if(rcode == NO_ERROR) 
      zeroimage(255, &tmptext);

   rcode = addtext(0x808080, 48, "ARIAL BOLD", caption, &tmptext);
   // Text is in tmptext, save it so you can examine it later
   rcode = savejpg("tmptext.jpg", &tmptext, 75);

   // Put shadow on the background
   rcode = multiplyimage(&resimg, &tmpshadow, &resimg);
   if(rcode == NO_ERROR) 
      // Put text over the shadow on the background
      rcode = multiplyimage(&resimg, &tmptext, &resimg)

   rcode = savejpg("new.jpg", &resimg, 75); // Save the result

   freeimage(&tmptext);
   freeimage(&tmpshadow);
   freeimage(&resimg);

   return(rcode);
}

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