making a thumbnail from a snapshot

[David Bovill]

Just from memory - you need to set the rect of the image to the nuew
thumbnail size and let rev do the scaling for you... then you can get the
imagedata which returns the scaled image data and set the imagedata (ie set
the imagedata of image "thumbnai"l to the imagedata of image "thumbnail")

But looking at your script - I don;t think you need to do any of that - you
just need to:

put image "mDisplay" of stack "dispStack" into img "mThumb" of group
newGpName of stack ".....

and make sure the thumbnail image has its location locked. Then you can:

set the imagedata of image "thumbnail" to the imagedata of image "thumbnail"

if you want to scale down the new image size.

On 13 February 2010 23:03, Peter Brigham MD <pmbrig at gmail.com> wrote:

> I'm trying to make a thumbnail from a snapshot of an image from another
> substack. First I clone a group that contains a thumbnail image and a text
> field, then I reposition the new group, then I try to get a new thumbnail
> into the new group. Here's what I've tried (partial script):
>
>   clone group "imgItem 1"
>   set the name of it to newGpName
>   --  newGpName is already constructed, it is "imgItem k" for some k
>   --  now set location of new group
>   set the top of group newGpName to 30
>   set the left of group newGpName to the left of group "imgItem 1"
>   --  store the new rect of the thumbnail, then delete it
>   put the rect of img "mThumb" of group newGpName into thumbRect
>   delete img "mThumb" of group newGpName
>   --  import new image into cloned group (last group)
>   start editing group newGpName
>   import snapshot from image "mDisplay" of stack "dispStack"
>   --  rename image
>   set the name of last image to "mThumb"
>   stop editing background newGpName
>   --  resize image to thumbnail size and location
>   set the rect of img "mThumb" of group newGpName to thumbRect
>
> What I get is not a properly sized thumbnail -- I get an image that looks
> the size of the whole new (cloned) group, and it's not a miniature of the
> big image, it's a crop of the big image. I can't remember how to miniaturize
> an imported snapshot down to thumbnail size. I know this has been discussed
> before but can't find it in the gmane archives. Any help appreciated.
>
> -- Peter
>
> Peter M. Brigham
> pmbrig at gmail.com
> http://home.comcast.net/~pmbrig <http://home.comcast.net/%7Epmbrig>
>
>
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