On 12/20/2013 09:21 PM, Andrew Gray wrote:
Hi Lars,
The original scans are large single-page TIFFs (or JP2? not immediately sure) from which these files were extracted - as you've noticed, they're not taken from the PDFs.
The master images aren't available online, but I believe this is more for reasons of scale and size than from a desire to keep them protected - I know they've been made available to on-site researchers without any restrictions. You'd be best off contacting the BL team if you want access to the originals.
Of course I can't know if there is an "original" scan in even higher resolution, but the one found in the PDF has been reduced too far, down to c. 150 dpi, where some fine print is no longer legible. What I want is one that has only been reduced down to 300 dpi or so. How can I get that?
I have written to the BL webmaster. But there is also a chance that someone else has been able to scrape the BL website?
The item viewer for this book opens at http://access.bl.uk/item/viewer/lsidyv36f7e082 where "lsidyv36f7e082" apparently is its ID. Good. The opening title page is http://access.bl.uk/item/viewer/lsidyv36f7e082#ark:/81055/vdc_000000011B9D.0... where the trailing "007" is the sequential number of the scanned page. Also good.
If I right-click and "view image", I get the whole title page in minimum zoom, but its URL is 430 kilobytes long, starting with "data:image/png;base64,iVBORw". So this is apparently the image (430 kbytes). As I zoom in and "view image", I get similar sized (1-2 MB) tiles of the whole page, at a higher zoom level.
I'm no JavaScript expert, but the display frame's source in one place says "jp2level1=5", which might be an indicator of what's behind.
The images found on Flickr are in the 300 dpi resolution that I want, but they only cover the illustrations, not all text pages.