[OLPC library] Image sizes on the wiki was: working hard @ Boston's

Frederick Grose fgrose at gmail.com
Wed Apr 11 09:42:24 EDT 2012

On Sun, Apr 8, 2012 at 1:38 PM, Christoph Derndorfer <
e0425826 at student.tuwien.ac.at> wrote:

> On Sat, Apr 7, 2012 at 8:31 PM, S Page <skierpage at gmail.com> wrote:
>> On Fri, Apr 6, 2012 at 16:07, Christoph Derndorfer
>> <e0425826 at student.tuwien.ac.at> wrote:
>> > If jumping over these extra hurdles bring a lot of value and can be
>> described
>> > in simple terms then I'm all for it
>> Good point.  I see you're writing "MISSING IMAGE", that's fine too.
>> My alternative lets a writer show a placeholder image, see
>> http://wiki.laptop.org/go/User:Skierpage#Placeholder_images . Either
>> way makes it easy to find missing images.
>> I documented both under
>> http://wiki.laptop.org/go/Help_Activity_refresh#Images
>> I notice the instructions say 800px wide screenshots. I think it's
>> faster/better to leave them at 1200 wide and tell the HTML or markup
>> to display them smaller.
> Hi there,
> thanks a lot for adding the instructions to
> http://wiki.laptop.org/go/Help_Activity_refresh#Images, much appreciated.
> As for the width of the screenshots we chose the 800px wide because that
> works well for consumption on the XOs (as it leaves plenty of space for a
> menu, etc.).

When a 1200x900 pixel image is uploaded to the wiki and then displayed at
an alternate size, such as with the [[File:Screenshot wanted.png|800px|*
ActivityName* screenshot]] wiki code, then the wiki resizes and saves a
.png copy of the image at 800 pixel width in an /images/thumb/ branch
See, for example, all the sizes saved here:

(Direct navigation to the thumb branches on wiki.laptop.org has been
blocked.  One only sees the message, "Down for upgrades. Come back

The 120px and 320px images are saved for the thumbnail and preview on the
File page.  The others are generated when a new cropping width is requested
by some wiki code.  This allows the wiki server to cache the images for
better performance.  This also means that the XO laptop, or any browser
does not need to process the original image size.


I see little value in keeping the 1200px wide version (with the exception
> of reducing one step in the image work) as we can't count on having the
> manpower to do extensive post-processing, resizing of all images, funky
> exporting, etc. once everyone leaves here in just over 48 hours...
> Christoph
> --
> Christoph Derndorfer
> volunteer, OLPC (Austria) [www.olpc.at]
> editor, OLPC News [www.olpcnews.com]
> contributor, TechnikBasteln [www.technikbasteln.net]
> e-mail: christoph at derndorfer.eu
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