Leadtool detecting wrong image compression type

Hi,

I am creating an image dump after scanning a page
when i try to open this dump image file with leadtool evaluation version 16.5, L_FileInfo() detects this image compression as JPEG and finally returns error no = -11.
I have attached the image dump for your reference.
Can you please help me on this.

Scanner Details:
----------------
InoTec M06 / SCAMAX 4x2xx (connected via RJ45)
- M0612CD / 412CD
- mainboard firmware 60-60-60
- controller firmware 3.03.46
- display firmware 3.04.03
- PostEndorser = Y
- PreEndorser = n/a
- TWAIN: 1.076
- ISIS: 1.0.10808.18001

Bits per pixel = 1
DPI = 200
Compression = CCITT G4

Thanks & Regards,
Sitesh

Sitesh,
The attached image does not appear to be a valid image. It does not have width and height information in it. Can you tell me how exactly you dumped the scanned image and created the attached file?

Is there a way to see this problem in a very small test application (not your full project)? If yes, please send me this test project in a ZIP or RAR file and I will check it for you.

Hi Adnan,

I saved the raw bytes which has come from scanner into a binary file and then tried to open this file using the Main Demo LeadTool application.

This error happens sporadically.

In other cases it returns me Error = -9.
Please find the attached file for
which I get Error (-9).

I have also attached the image dump when I scanned a color image with JPEG compression and I am able to open this file successfully with LeadTool.

Regards,
Sitesh

If you're dumping raw pixel data without saving a file format header, you will need to use the raw loading method of LEADTOOLS. This is explained in the help topic "working with the Raw filter".

Hi Adnan,

I receive the image data from the scanner and i check for image type using LeadTool.

//pseudo code
CodecsImageInfo info = codecs.GetInformation(FileName, true);

if(info.Format == "JPEG")
{
//Do something...
}
else
{
//Do something...
}

To get image information, I used RasterCodecs class's GetInformation(string fileName, bool totalPages)
function and it returned me Image compression as JPEG and Bits per pixel = 8.
But my scanner is configured to send CCIT G4 compressed image with Bits per pixel = 1.
I attached image file (Test.tif) in my first post for which I get this problem.

to summarize the main question:
-------------------------------
In this case i know the image is a tiff.
why does leadtools return a "positive“ result when checking for jpeg?
what makes it think it was a jpeg?


thanks in advance

Sitesh

The image is definitely not a TIFF file, but it could be raw CCITT Group 4. In this case, you will need to use the raw loading mechanism of LEADTOOLS. I can try that, but I will need to know the exact width and height of the image in pixels.

Please note that raw binary data can trigger a false positive because it basically contains random bytes. Some of these bytes could resemble the properties of other formats like JPEG.

Hi Adnan,

Image width = 1653
Image height = 2315
X Resolution = 200
Y Resolution = 200
Compression = CCIT G4

Thanks,
Sitesh

Sitesh,
When I loaded your image into our .NET demo, I got a blank scanned page (not data on it). Is this the page you are dumping? If yes, you can load it using our demo as follows:
1- Open Main C# demo shipped with our toolkit.
2- From File menu-> Open Raw.
3- Browse to your image file, then click OK. The loading Raw dialog box will open.
4- Set the values inside the dialog according to your settings.

The demo uses the RasterCodecs.CodecsRawOptions class and the LoadInformation event to load Raw data images.