Legacy ImageMagick Discussions Archive

Hi

I am trying to create a series of filters that can create a vintage look for a photo on the fly using the tutorial:
http://gimpology.com/submission/view/au ... age_effect as a guide.

I can manage the contrast and saturation changes alright however I am not quite sure how to apply the color levels they suggest.
Also how can I set a vignette's opacity to just 50%

Thanks

mrtrombone wrote:Hi

I am trying to create a series of filters that can create a vintage look for a photo on the fly using the tutorial:
http://gimpology.com/submission/view/au ... age_effect as a guide.

I can manage the contrast and saturation changes alright however I am not quite sure how to apply the color levels they suggest.
Also how can I set a vignette's opacity to just 50%

Thanks

IM does not have multi-break point or curves transformations. But you can use -level, +level. See
http://www.imagemagick.org/Usage/color/#levels

I have two unix bash scripts, plm and curves that will do multi-point transformations, but you will have to separate channels, apply them and then combine them together as the scripts apply the same transformation to all channels. See
http://www.fmwconcepts.com/imagemagick/index.html

For vignetting, see http://www.imagemagick.org/Usage/transform/#vignette
You can change the background color to one that has transparency.

Also you can create an oval mask using -draw and use it to control the transparency of the outer region using convert -compose <option> -composite

see
http://www.imagemagick.org/Usage/compose/
http://www.imagemagick.org/Usage/channels/

Thanks

I'll post an update of how it gets on in case anyone else is interested