Page talk:Henry IV Part 1 (1917) Yale.djvu/13

Separate image

@EncycloPetey: What's the purpose of extracting this page image into a separate file? The relevant image is essentially the whole page, modulo a tiny bit of excessive margin at the bottom and right. Unless a separate image allows us some kind of significant improvement I don't see the point of it. --Xover (talk) 09:11, 12 January 2019 (UTC)

It allows Wikipedia to use the image as well, and allows for a much better image. The image file in the DjVu is a compressed version. Take a look at the map from Macbeth and compare it to the page from the DjVu scan. Further, a separate image file will allow the user to click on the image to enlarge it, which isn't possible other wise. --EncycloPetey (talk) 15:03, 12 January 2019 (UTC)

@EncycloPetey: So far as I know there is no functional difference in MediaWiki between referencing a specific page in a multi-page format media file (PDF, DjVu, TIFF, etc.) and referencing the same page in a single-page format media file, and Wikipedia can use it this way just as well as we can (it's basic MediaWiki image functionality). And I don't see how extracting the page and cropping it would lead to higher quality or even simply higher resolution? --Xover (talk) 18:55, 12 January 2019 (UTC)

I didn't extract from the DjVu file, I extracted from the pre-compressed files.

Also, extracted images can be categorized, annotated, and sorted at Commons. A page buried within a DjVu file cannot be handled this way. --EncycloPetey (talk) 18:57, 12 January 2019 (UTC)

@EncycloPetey: Ah, I see. Yes, that does make sense. However, I'll note that the economy of this is borderline in this case: the raw JPEGs are effectively the same resolution as the DjVu, and colour/contrast adjustments and avoiding wavelet-compression artefacts gives only marginal improvements. However, the logo on the title page was harder hit by the compression so I redid that to good effect. --Xover (talk) 10:08, 13 January 2019 (UTC)