Dynamsoft TWAIN Products

Dears,
I'm using Dynamic Web Twain (V6.1Trial) and I’m trying to solve the following problem:
1. user should be able to scan whatever image size with a 300DPI resolution scanner.
2. I have to save the scanned image as jpeg after resizing it to be (7K size) under even if i need to reduce the image resolution.
for that, I have wrote the following code in Javascript,
the problem is that I’m checking the value of the dynamic Web Twain resolution and find it = 100 even after the debugger passed by the resolution set line of code.

Notes:
1. I'm using the Virtual Web scanner (XPCTWAIN) for the scanning simulation purpose.
2. I need to achieve the 7K size result even if with lower resolution.
3. Trying to just resize the image is not a solution since I have a minimum limit values for the image dimensions.

I would be grateful if you help me to resize my images with whatever resolution to obtain the 7K image as a result.

// Javascript code that handles the scanning action.
function ScanImage(sender, args) {
debugger;
var sourceData = $get(source);
with (document.all) {
activeForm.DynamicWebTwain1.SelectSourceByIndex(sourceData.options.selectedIndex);
activeForm.DynamicWebTwain1.CloseSource();
activeForm.DynamicWebTwain1.OpenSource();
activeForm.DynamicWebTwain1.IfDisableSourceAfterAcquire = true;
activeForm.DynamicWebTwain1.Resolution = 75; // Resolution = 100 here !
activeForm.DynamicWebTwain1.AcquireImage();
}
return false;
}

//Javascript function that resize the scanned image to a smaller dimensions to try to get the required size 7 K.
function CompressImage() {
activeForm.DynamicWebTwain1.LoadImage(filepath);
activeForm.DynamicWebTwain1.ChangeImageSize(activeForm.DynamicWebTwain1.CurrentImageIndexInBuffer, 90, 114, 1);
activeForm.DynamicWebTwain1.SaveasJPEG(filepath, activeForm.DynamicWebTwain1.CurrentImageIndexInBuffer);
return false;
}

Hi Samar,

Besides using Resolution and ChangeImageSize, you can also change the pixel type to reduce the image size. Black&White and gray images are expected to have smaller size. JPEGQuality can also contribute to the image size.

You can take a look at the following page for more information:
http://kb.dynamsoft.com/questions/170/H ... loading%3F

Thanks.