Re: Watermark print behind image.

Howdy,

I am using Raster Imaging Pro v14 and am looking to add the words "Uncertified" diagonally across the page in a "faint" print behind tif images as they are printed.  What would be the best way to do this?

thanks

dbl

Thank you Maen,

I understand the combining of the two images but I am curious if there is a way to get the "word" diagonally across the page.  The function that I looked at would do it across or down but not diagonally.  This may be a stupid question and I just didn't see it in the documentation but I thought I would ask anyway.

Thanks

dbl

Hello,

I have finally gotten around to implementing this watermark function and I thought I had it working well until I started combining with images that had a large amount of Black background.  When I did you can tell that they are getting "blended" with white dots.

Here is my Watermark function,  can you tell me what I am doing wrong?

 

void WatermarkImage(char *psFileName, char *psWatermarkText, char *psWatermarkFontName, int iWatermarkFontSize, int iWatermarkAngle)

{

const char *psModuleName = "WatermarkImage";

long lRC = 0;

BITMAPHANDLE TiffHandle;

BITMAPHANDLE WatermarkHandle;

FILEINFO FileInfo;

HDC hdcImage;

HDC hdcWatermark;

long lRet = 0;

FileInfo.Flags = 0;

msOutput.Format("%s - Opening File for Watermark**", psModuleName);

UpdateLog(msOutput, false);

lRet = L_LoadBitmap(psFileName, &TiffHandle, sizeof(BITMAPHANDLE), 0, ORDER_BGRORGRAY, NULL, &FileInfo);

if (lRet != SUCCESS)

{

msOutput.Format("%s Error - Error %d Loading %s file**", psModuleName, lRet, &psFileName[0]);

UpdateLog(msOutput, true);

lRC = -1;

}

else

{

msOutput.Format("%s - File Opened for Watermark. Height:%d, Width:%d**", psModuleName, FileInfo.Height, FileInfo.Width);

UpdateLog(msOutput, false);

hdcImage = L_CreateLeadDC(&TiffHandle);

lRC = L_CreateBitmap (&WatermarkHandle,

sizeof(BITMAPHANDLE),

TYPE_CONV,

FileInfo.Width,

FileInfo.Height,

FileInfo.BitsPerPixel,

FileInfo.Order,

NULL,

BOTTOM_LEFT,

NULL, 0);

lRC = L_CopyBitmapPalette(&WatermarkHandle, &TiffHandle);

hdcWatermark = L_CreateLeadDC(&WatermarkHandle);

UINT nOptions = 0;//DT_CENTER;

RECT rect = {0,0,FileInfo.Width, FileInfo.Height};

LOGFONT lf;

memset(&lf, 0, sizeof(lf));

lstrcpy(lf.lfFaceName, psWatermarkFontName);

lf.lfHeight = iWatermarkFontSize * -20;

lf.lfEscapement = iWatermarkAngle * 10;

lf.lfOrientation = lf.lfEscapement;

lf.lfClipPrecision = CLIP_LH_ANGLES || CLIP_TT_ALWAYS;

lf.lfWeight = FW_THIN;

DrawRotatedText(hdcWatermark, psWatermarkText, &rect, lf, iWatermarkAngle, nOptions);

BLENDFUNCTION bfImage;

memset(&bfImage, 0, sizeof(bfImage));

bfImage.BlendOp = AC_SRC_OVER;

bfImage.BlendFlags = 0;

bfImage.SourceConstantAlpha = 70;

bfImage.AlphaFormat = 0; // AC_SRC_ALPHA

BOOL bRC = false;

L_AlphaBlendBitmap(&TiffHandle, 0, 0, FileInfo.Width, FileInfo.Height, &WatermarkHandle, 0, 0, 35);

msOutput.Format("%s - Saving File:%s, bRC:%d**", psModuleName, psFileName, bRC);

UpdateLog(msOutput, false);

lRet = L_SaveBitmap(psFileName, &TiffHandle, FILE_TIFX_FAX_G4, 0, PQ1, NULL);

if (lRet != SUCCESS)

{

msOutput.Format("%s Error - Error %d saving %s file**", psModuleName, lRet, &psFileName[0]);

UpdateLog(msOutput, true);

lRC = -1;

}

else

{

msOutput.Format("%s - saved %s file**", psModuleName, &psFileName[0]);

UpdateLog(msOutput, false);

}

L_FreeBitmap (&TiffHandle);

lRC = 0;

}

}

You are saving to a format that only supports 1-bit black-and-white images. This means the resulting image cannot contain colors or shades of gray. That's probably why the resulting image contains a 'dithered' pattern of black and white dots.
If that's not the problem you're facing, can you send a sample source image that shows the problem to support@leadtools.com or post it here? If you send or post files, please put them in a ZIP file first.

"You are saving to a format that only supports 1-bit black-and-white images. This means the resulting image cannot contain colors or shades of gray. That's probably why the resulting image contains a 'dithered' pattern of black and white dots."

I don't need colors or shades of gray.  I need to put a watermark on the image without affecting the rest of the image.

I am attaching the original and the result.  Please let me know what I can do to fix this.

Thanks

Dbl

I think you want to prevent the 'dithering' effect that took place in the image, but obtain a 'dithered' or dotted watermark text just like in the result image. Is this correct?
If yes, change your code to do the following:
1. Load the TIFF image as 1-bit, but don't create a LeadDC for it.
2. Create the Watermark image as 8-bit grayscale. Draw the text on it (using Windows GDI for example), but using a light color or light shade of gray.
3. Use L_ColorResBitmap to convert the watermark image to 1-bit and use one of the dither flags with it.
4. Use L_CombineBitmap with a flag value of CB_OP_AND to move the black pixels from the watermark to the destination image.