ConvertTo1Bpp

[dixus]

Hi,

i am scanning in grayscale because barcode recognition doesnt work well in 1 bit mode.

After i have scanned a multipage tiff i want it to convert to 1 bit.

Can I use the method ConvertTo1Bpp? If yes how? I always lose all pages after the first page of the tiff.

Tyvm
dix

[Loïc]

Hi dix,

yes you can:

- Open the multipage tiff in read&write mode
- Select each page and apply negative effect
- Save the multipage tiff to file

Let me know if you need code snippet.

Kind regards,

Loïc

[dixus]

thanks loic. that was the next what i wanted to try.

[dixus]

that worked. perfect. ty.

another question. its a bit offtopic but i wrote that i have issues with barcode recognition.

I need 8 bits and 300 dpi. Do you have other expierences? That means should it work with 150 DPI or is it not possible to define borders here?

ty
dix

[Loïc]

Hi dix,

unfortunately there is no optimal configuration for all cases. it depend on the way your pages are acquired, they content and structure.

if you want a feedback on non-recognized barcode you can attach the image including it.

Loïc

[dixus]

yep i thought so.. i think that our scanner is the problem.... its just bad quality at 150 DPI.
Is there anybody that successfully detected barcodes at 150 DPI?

[Loïc]

Yes,

anyway 200-300 DPI should result in higher accuracy. Maybe scaling the image before doing the process can help.

IE:

Code: Select all

Imaging1.Scale(ImageID, 200 / 150 * 100, Drawing2D.InterpolationMode.HighQualityBicubic)

Hope this helps !