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nLab > Diagrams: Figures, Graphics, Images --- Oh My!

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  1.  
    • CommentRowNumber1.
    • CommentAuthorJonAwbrey
    • CommentTimeSep 9th 2009
    I'm sure I haven't looked everywhere yet, but I still can't figure out how to scale images.

    I have a lot of Big Pix that I need to scale down to inline size.

    Jon
    • CommentRowNumber2.
    • CommentAuthorAndrew Stacey
    • CommentTimeSep 9th 2009

    Do you want to scale the actual images or just how they appear? If the former, what system are you on? If the latter, I don't know if there's a markdown syntax but you can always include raw XHTML (but it's your responsibility to ensure that it is valid!).

    • CommentRowNumber3.
    • CommentAuthorMike Shulman
    • CommentTimeSep 9th 2009

    Scaling the actual images is always friendlier to the viewer; faster to download.

    • CommentRowNumber4.
    • CommentAuthorAndrew Stacey
    • CommentTimeSep 9th 2009

    Well, except that if you scale images to just the right size then someone who needs to magnify pages to read them gets a short deal. I think it's worth looking into the advice of some of the accessibility people (must be easy to find!) to see what the best original size for an image is. Obviously one doesn't want to have it too big otherwise one does run into the download speed problem, but, for example, twice as big wouldn't be too problematic. I guess that's one advantage of SVGs so absolute best would be to convert them all into SVG.

    • CommentRowNumber5.
    • CommentAuthorEric
    • CommentTimeSep 9th 2009
    To see how I did it, you can have a look at the source of

    http://www.ncatlab.org/ericforgy/show/diamonation

    I basically uploaded the file as described here:

    http://golem.ph.utexas.edu/instiki/show/File+Uploads

    Once the file is uploaded, I used HTML (see source code).

    Hope that helps!
    • CommentRowNumber6.
    • CommentAuthorJonAwbrey
    • CommentTimeSep 9th 2009
    I'm using the Drawing app in StarOffice7 -- it's supposed to export SVG, but MediaWiki didn't seem to like what it put out the last time I tried, so I've been exporting mostly JPEGs or the EPS files that PlanetMath likes.

    To get decent quality I often have to work at 5x enlargement and then scale things back down with the scaling factors that MediaWiki or PlanetMath use --- like 20px to scale an image down to 20px.

    Here's a budget of examples:

    http://mywikibiz.com/User:Jon_Awbrey/GRAPHICS#Cactus_Graphs

    Jon
    • CommentRowNumber7.
    • CommentAuthorJonAwbrey
    • CommentTimeSep 9th 2009
    Eric,

    Thanks! It really, really works!

    <img src='http://mywikibiz.com/images/0/0a/Tangent_Functor_Ferris_Wheel.gif' width='350'/>

    Jon

1 to 7 of 7

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