"Daniel Antonio Peraza Cedrez" on wrote...
| Hi. I'm using Magick++ to code an example of the Affine Transformation but
| once I build the DrawableAffine object with this matrix: {1, 0, 0, 1, 50,
| 100} and I use image.write(filename) I got exactly the same image that I
| used as input.
|
Of course you did. All you did was move the image around on the virtual
canvas. That is the images virtual offset changed!
See...
Affine Translations
http://www.cit.gu.edu.au/~anthony/graphics/imagick6/distorts/#affine_trans
What format did you save as? JPEG does not under stand virtual
canvases, PNG does. GIF also except for negative positions.
| I noticed this problem working under MS - Windows using the command convert
| -affine 1,0,0,1,50,100 -transform input.jpg output.jpg
|
Yeap.. JPEg would not have saved the new position.
You could try -flatten after the -transform, whcih will 'fill out' the
virtual canvas with the current background color.
| (by the way, I don't
| know what is the role of the -transform option in this command neither if
| it's necessary to achive the desired effect in Magick++). By the other hand,
| some guys from Java Advanced Imaging (which I was testing too) told me there
| was no way of coding the Image's coordinate system origin into a file;
|
Told you. JPEG does not have an understanding of virtual canvas info.
PNG does but few things use it. GIF can have a positive offset and Web
servers will understand it.
|
| I
| wonder if your convert -affine command under linux (which is really the only
| one that achives the effect) is using some other tricks to do its work.
|
| I'd appreciate somebody could explain me this.
|
| Thanks.
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Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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