BW conversion with invert check

Hi,

I am using Lead Tools Raster Pro V13.

I am converting non Black/White images to Black/White. I then check if the image is inverted and correct it if so. The problem I have is the resulting image,inverted or not, is "blocky" or "pixelated". If I save it to file and then load it again, it looks great! How can I get the same results without saving to file and reloading?

Thanks.

Best regards,

Ken

Here is the code I use.

'Convert to BW

ctlLeadViewer.Grayscale 8
ctlLeadViewer.ColorRes 1, CRP_FIXEDPALETTE, CRD_NODITHERING, 0
LeadOLEColor = ctlLeadViewer.BitmapPalette(0)
If LeadOLEColor <> 0 Then
   'image inverted-swap palatte values
   ctlLeadViewer.BitmapPalette(1) = ctlLeadViewer.BitmapPalette(0)
   ctlLeadViewer.BitmapPalette(0) = 0
End If
ctlLeadViewer.PaintScaling = PAINTSCALING_RESAMPLE

'Save to file

    ctlLeadViewer.GetFileInfo pstrTempFile, pPage + 1, 0 'FILEINFO_TOTALPAGES
    ctlLeadViewer.SaveIFD = ctlLeadViewer.InfoIFD
    ctlLeadViewer.SavePage = 1
    ctlLeadViewer.Save pstrFileName, FILE_CCITT_GROUP4, ctlLeadViewer.BitmapBits, pintCompression, Save_Overwrite

ctlLeadViewer.SaveIFD = 0

Reload it

    ctlLeadSource.GetFileInfo pstrFileName, pPage + 1, 0
    ctlLeadSource.LoadIFD = ctlLeadSource.InfoIFD
    ctlLeadSource.Load pstrFileName, 0, pPage + 1, 1
    ctlLeadSource.LoadIFD = 0
    ctlLeadViewer.Bitmap = ctlLeadSource.Bitmap

The image looks great after reloading.

 

Hi,

I am using Lead Tools V13.0.0.53

I have attached a zip file that contains the original bmp (Original.bmp). It is a 24bit True color image.Also I added a screen scrape(Converted1bit.bmp), that represents the results I get after using Lead.Grayscale and Lead.ColorRes.

If I simply reload the file after the conversion, as in my code above, the pixelization is gone and the image looks like the original....only it is now a 1 bit image, which is what I want.

Best regards,

Ken

Moderator: Please move this to the other post with the same name. I tried to reply to the other thread but it placed it here.

Hello,

To improve the display quality of image, after changing the image to 1-bit, try to BitonalScaling property to BITONALSCALING_SCALETOGRAY and repaint the image.
+----+
ctlLeadViewer.ColorRes 1, CRP_FIXEDPALETTE, CRD_NODITHERING, 0

ctlLeadViewer.BitonalScaling = BITONALSCALING_SCALETOGRAY
ctlLeadViewer.ForceRepaint
+----+

Please let me know if this helps.

Thanks,
Maen Badwan
LEADTOOLS Technical Support

Hi Maen,

Sorry to say but that didn't have an effect.

I would guess the conversion samples the pixels color and determines whether to convert it to Black or White and then applies the dither method. I know I can choose different dither methods, but is there a way to adjust the threshhold used when converting to 1 bit?

Thanks.

Best regards,

Ken