How to define the value of resolution-number

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ggcoke
2012-09-18
2012-10-06
  • ggcoke
    ggcoke
    2012-09-18

    Hello,
    We use VIPS to convert jpeg to tiff file, using the command "vips im_vips2tiff
    test.jpeg test.tif:deflate,tile:128x128,pyramid" and it works to generate the
    correct tiff file. And the resolution number is 7. I wander how can I define
    this value by myself to get more scales to zoom.

    Thanks
    GGCoke

     
  • Ruven
    Ruven
    2012-09-18

    You want even smaller resolutions? Vips will create enough resolutions so that
    the smallest fits wholly into a single tile, so in your case, the smallest
    will be less than 128x128 pixels in size. I think imagemagick will create an
    extra smaller one by default.

    Or are you asking about intermediate resolutions, not just a factor of 2? For
    this, you'll have to modify the vips source code or create the layers and
    assemble yourself using the libtiff tools. But the viewers currently assume x2
    scaling, so they may not work properly ...

     
  • ggcoke
    ggcoke
    2012-09-19

    I want the pic can zoom in more because it is not clear enough. So we need
    bigger resolution scale.

     
  • Ruven
    Ruven
    2012-09-19

    OK, well IIPImage will not do this kind of interpolation for you, so you will
    need to rescale your image up first, then save for use with IIPImage.

     


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