When I make a pdf of a scanned image about 2mb, which is too larg

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   Page 1 P3PC-1432-08ENZ0 fi-5900C Image Scanner Operator's Guide... Page 3: Introduction INTRODUCTION Thank you for purchasing the fi-5900C Image Scanner. The fi-5900C is an image scanner designed to scan various documents in large quantities. The fi-5900C has the following features. This manual describes the scanning method using ScandAll 21.
   

If that is the last page that has the streak use a blank page in the original scan as the last page and then the dark line wont cover the image.

Here you will find a product to compress your PDF documents http://www.systoolsgroup.com/pdf-toolbox/compress-pdf-files.html

while scanning try reducing the DPI of the scans. this will make the image smaller in size but it will effect the picture quality very little. but do keep in mind that the dpi must be atleast 70 for better picturization

Go to scanner options, settings

Please change the resolution, set it to 75.

also please check if the setting set to original size x 2 or anything.

It should be original size also.

Cheers

Try lowering the DPI setting in your scanning software. If you cant find that there are many programs that will resize images. Windows picture manager is one. Save the scan, then resize it using software, then email.

The scanner produces a "picture" of the document, much as if you laid it flat on a table and took a picture of it with your digital camera. If you did this, your .jpg from the camera would be several hundred K at a minimum - comparable to the file size off the scanner. That's why the file is so big, it contains a picture and not text data - even though it's still a .jpg file.
If you reduce the scan resolution you will save space, but at the expense of legibility of the document image. To get it down to the smallest possible size, you will need to run the scanned image through OCR ( Optical Character Recognition ) into a Word document for example, and then print it out to a .pdf file. If you have a clean source document with few graphics this isn't as difficult as it may seem. Microsoft Office has an excellent OCR process known as Document Imaging. You need to carefully proof read the result but with a clean input Document Imaging is amazingly accurate in Office 2007.
In short, there is no easy solution to your problem.

This sounds like you are trying to scan images at a larger size than they actually are?
I am not an expert-(but I have a Mac)-but from what I'm reading, scan your photos at a 300-600 dpi resolution, then use photo editing software to enlarge them. The higher the resolution, the more disk space and the more photo detail (i.e. cracks, dust, scratches, paper type) will be captured, and the more time it will take to scan. Also, for the white, does your scanner allow you to select the area/define borders during the pre-scan? Mine lets me drag borders to just the image area (but capture the image first, then do the cropping and editing to a copy later).
Rookie2112

That entirely depends on your scan settings. The resolution has a huge impact on file size - doubling the resolution from, say. 150dpi to 300dpi actually quadruples your file size. That being said, your scans are probably saved as BMPs. If you scan to Paint or a proprietary image editor (like Photoshop), then you can save in a compressed format like JPG or PNG and reduce the file size some more.

Bottom line - if you're scanning a full size (8.5x11) page, then less than 2MB per page is pretty decent, especially if the file is a BMP. If these are 4x6 photos, then it's still not bad if you're using a resolution like 300dpi. My digital camera takes photos at 5megapixels and the files are often 1-2MB each, and those are just photos.