possible bug IM 7.0.8.46 -alpha deactivate/activate

[fmw42]

From the porting guide:

-alpha activate/deactivate
enables and disables the alpha channel, respectively, with persistence. This is like on/off in Imagemagick 6. In Imagemagick 7, -alpha off will remove the alpha channel permanently such that -alpha on will not re-enable it.

But that does not work in IM 7.

Input:


IM 7.0.8.46

Code: Select all

magick text.png -alpha deactivate -blur 0x6 -shade 135x5 -alpha activate -normalize +level 30% shaded7.png

IM 6.9.10.46

Code: Select all

convert text.png -alpha off -blur 0x6 -shade 135x5 -alpha on -normalize +level 30% shaded6.png

[magick]

Grab the latest beta (building now). This command works for both IMv6 and IMv7:

Code: Select all

convert text.png -alpha deactivate -blur 0x6 -shade 135x5 -normalize +level 30% -alpha activate shaded7.png

There is a slight difference in shading. You can change the intensity to Rec609 and the results should match.

[fmw42]

In IM 7.0.8.47 beta Q16 Mac OSX, this command produce no bevel from the -shade as it should in comparison to the IM 6 result above.

Code: Select all

magick text.png -alpha deactivate -blur 0x6 -shade 135x5 -normalize +level 30% -alpha activate shaded7a.png

So there is still an issue.



Understood about the colorspace. IM 6 uses Rec601luma and IM 7 use Rec709luma. So you meant to say use -intensity Rec601luma to make IM 7 reproduce IM 6 results.

[magick]

Try now. We built a new Beta release.

[fmw42]

Yes. It seems to work fine now in the 7.0.8.47 beta. Thanks