Can the iPad2, with its 132ppi 1024 x 768 screen, be used to comfortably read pdfs without the need to zoom and scroll about single pages?

That was a question that troubled me when I was splashing out for one earlier this year. To try to get a better idea of what a pdf viewed on only 800,000 pixels might look like was hard. Neither my attempt to I resize a pdf window to the correct number of pixels (too small) nor my attempt to screengrab  a pdf at a higher resolution and shrink it using GIMP (too fuzzy) were particularly informative. I just had to take plunge and see.

There’s enough wiggle-room (as you can see in the screenshots below) to suggest that there’s no definitive answer, I think the answer is probably yes. But, that’s only if you take advantage of some nifty capabilities of pdf-reading apps, Goodreader being the one I use, mostly thanks to its almost seamless Dropbox syncing capabilities.

Below is a screengrab of a standard, US letter-size, pdf, displayed unmodified on the iPad. The size, when the image is viewed inline with this text (and not in its own separate window), is approximately the same as it appears on the iPad (there is some loss of resolution which can be recovered if you click on the image and open it in its own window).

Click on the image to simulate holding the iPad close to your face whilst squinting.

The screengrab above demonstrates that virgin pdfs aren’t great to read. The main body of the text can be read at a push, but it’s certainly not comfortable.

Thankfully, the bulk of the discomfort can be relieved using Goodreader’s cropping function, which allows whitespace around pdfs to be cropped out (with different settings for odd and even pages, if required).  A cropped version of the above page looks like this:
A marked improvement which could be cropped further if you weren't too worried about losing the header information. Click on the image to see the screengrab with no loss of resolution.

The image above demonstrates that cropping can be used to get most value from the rather miserly screen resolution (the same on both the iPad and iPad2, though almost certainly not on the iPad3, when that’s released).

But, cropping doesn’t solve all tiny text traumas.  There are some circumstances, such as with particularly small text like the figure legend below, that necessitate a bit of zooming.

The figure legend is a little too small to read comfortably, even when the page is cropped.

I don’t mind zooming in to see a figure properly, but that’s probably a matter of personal taste.

If you’re used to using an iPhone4, with its ridiculous 326ppi retina display, then you’ll find reading pdfs on a current model iPad a bit of a step back. But, it’s passable and I certainly don’t mind doing it. It certainly beats printing, carrying and storing reams of paper.

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