[magick-users] convert larger image

[Ross Presser]

On Wed, May 21, 2008 at 2:04 PM, Rob Redmon <Rob.Redmon at noaa.gov> wrote:

> I'm using 'convert' to rotate PNG images and having trouble in that the
> file size has grown significantly after the rotation.
>
> I start out with an image like:
>    [~/] file MD628_1958_AUG_IONOGRAM_3770.png
>    MD628_1958_AUG_IONOGRAM_3770.png: PNG image data, 4749 x 2368, 8-bit
> grayscale, non-interlaced
>

starting as 8-bit grayscale.


> Unfortunately, the file size has grown ~50%
>    [~/] file MD628_1958_AUG_IONOGRAM_3770-quality100_rotated.png
>    MD628_1958_AUG_IONOGRAM_3770-quality100_rotated.png: PNG image data,
> 4749 x 2368, 16-bit grayscale, non-interlaced
>

ending as 16-bit grayscale.

You probably have the _16 version of ImageMagick installed. Perhaps the _8
is needed.
Greased Lightbox <http://shiftingpixel.com/lightbox/>→←+-↻

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