tile problem after upgrade..

[dognose]

Hi,

I'm wondering what I'm doing wrong here, or what has changed..

I just upgraded from IM 6.4.8 to 6.6 .. and now this command doesn't work. ( It used to color dodge the tiled image on image-in )

composite -compose color_dodge -size "500x500" tile:tile.gif image-in image-out

Is there a better way to do this now?

[dognose]

Any ideas?

[snibgo]

and now this command doesn't work.

What happens instead? Error message? Computer catches fire?

Perhaps you can post sample inputs and expected output.

[dognose]

Well, the image-out is the same as the image-in

I guess the problem is with the "-size "500x500" tile:tile.gif" .. it's not making the tiled image.

If i make that image before hand, it works..
convert -size "500x500" tile:tile.gif tiled-in.gif

[snibgo]

Hmm. I don't use composite much, so don't know if it has changed. The equivalent "convert" seems to work fine:

Code: Select all

convert image-in -size "500x500" tile:tile.gif -compose color_dodge image-out

[dognose]

That animates the image for me.. instead of composing it.

[dognose]

hmm. well, it works if I change the command line order. .

composite -size "500x500" tile:tile.gif image-in -compose color_dodge image-out

[snibgo]

Sorry, I forgot the magic work "composite":

Code: Select all

convert image-in -size "500x500" tile:tile.gif -compose color_dodge -composite image-out

To make "convert ... composite" give the same effect as the "composite" command, you need to reverse the order of the two inputs.

[anthony]

Sorry, I forgot the magic work "composite":

Code: Select all

convert image-in -size "500x500" tile:tile.gif -compose color_dodge -composite image-out

To make "convert ... composite" give the same effect as the "composite" command, you need to reverse the order of the two inputs.

That is correct, the order is

Code: Select all

   composite   [color=#800080]source[/color] [color=#800080]background[/color]  -compose [color=#800080]method[/color]  [color=#800080]result[/color]

  convert [color=#800080]background[/color]  [color=#800080]source[/color]  -compose [color=#800080]method[/color] -composite [color=#800080]result[/color]

The reason for this is that "composite" only deals with one thing, so images are given in the order the 'method' refers to. For example: source OVER background

However "convert" is designed to in a more practical handling. you generate you background first, then overlay each source image onto that background. As such the order is reversed.

That same order is the order in which a layering operators like -flatten, -mosaic and -layers merge work.
The 'back' or 'lowest' image is given first, followed by the 'upper' images that are 'higher' in the image stack.


ASIDE: the ONLy thing that "composite" can do that "convert" can not do is 'tiling' the source image over the whole background image. (The "composite" -tile option)