Hi Peter, You can Reduce File Size in Preview App. Reduce File Size is alluring, but beware if you have images other than photos in your document. When you use Reduce File Size, Preview uses lossy compression to reduce the quality of every image in the document, making non-photos notably fuzzy. Photos see a quality reduction too, but the effects are less noticeable.
Reduce File Size has improved radically from earlier versions of Preview, which also deleted useful metadata like a PDF’s table of contents. I would suggest you test on a Duplicate of your PDF first, to see if you are happy with the result. Open the PDF, then choose File > Export. Click the Quartz Filter pop-up menu, then choose Reduce File Size. <https://www.hamrick.com/vuescan/html/vuesc33.htm#outputpdfsizereduction <https://www.hamrick.com/vuescan/html/vuesc33.htm#outputpdfsizereduction>> In VueScan Output Output | PDF size reduction You can use this option to write files with a reduced number of pixels. For instance, if size reduction is set to 3, then every 3x3 block of pixels in the image will be written as a single pixel, which is the average of these 9 pixels. This option will reduce the resolution and size of the file produced. These values will be displayed in the status area at the bottom of the VueScan window. However, this option produces better results than reducing the resolution of the scan, as the averaging of multiple pixels results in a similar noise reduction benefit as multi-sampling. See Input | Number of samples <https://www.hamrick.com/vuescan/html/vuesc29.htm#inputnumberofsamples> and Input | Number of passes <https://www.hamrick.com/vuescan/html/vuesc29.htm#inputnumberofpasses>. Cheers, Ronni 13-inch MacBook Air (April 2014) 1.7GHz Dual-Core Intel Core i7, Turbo Boost to 3.3GHz 8GB 1600MHz LPDDR3 SDRAM 512GB PCIe-based Flash Storage macOS Sierra 10.12.4 > On 13 Apr 2017, at 8:05 pm, Rob Phillips <[email protected]> wrote: > > Hi Peter. > The Pro version of Adobe Acrobat lets you do this, but you might not want to > pay for this. Maybe the free Acrobat Reader does this... > > Rob > > On 13/4/17 4:15 pm, Peter Curtis wrote: >> Hi all >> >> I’m using VueScan for some documents which I need to email to another person >> on their phone. I scan as .pdf yet the file sizes are large (3.5MB) for a 12 >> page document. I’ve looked through the settings and preferences on ViewScan >> and can’t see any way of reducing the size. Is this size normal for a 12 >> page document? Is there any way I can reduce the size of the .pdf? >> >> Kind regards >> Peter
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