Error: Lossy operations are not currently supported

[binarykitchen]

Yesterday that error wasn't here. But today. What does this mean?

Running "imagemin:png" (imagemin) task
Warning: ** Error: Lossy operations are not currently supported
 Use --force to continue.

[kevva]

I've no idea. It's an error outputted from optipng.

[jamesplease]

@binarykitchen their issue tracker is here.

[binarykitchen]

Ok I will ask there. But I think since this module relies heavily on optipng, it concerns everyone of us here.

[binarykitchen]

Okay, reported in https://sourceforge.net/p/optipng/bugs/44/

[vladikoff]

@binarykitchen code snippet might help https://github.com/Juntalis/PyOptiPng/blob/master/src/optipng.c#L715

[binarykitchen]

@vladikoff I've seen it too but it doesn't tell me much. No hint on how to solve it, what the cause it etc.

Look, I did not touch my PNG files nor program code this week and then suddenly this happened. All I did is an npm update over many packages. Weird.

[vladikoff]

@binarykitchen clear the old PNGs, try optimizing with the new version of the plugin, 0.6.0 ?

[ctruta]

The resolution to this error is using an OptiPNG version that supports the option "-strip=all". The earliest version that supports this option is 0.7 (although using that old version is not recommended, because of other defects). The recommended stable versions are either 0.7.4 or 0.7.5.

Thank you very much for using OptiPNG :-)

[vladikoff]

@ctruta hey, we use 0.7.4 from https://github.com/yeoman/node-optipng-bin#node-optipng-bin-

[ctruta]

@vladikoff The "lossy operations not supported" error message exists in the 0.6.x line only. It was removed from version 0.7, when the option -strip got implemented. I guess you might pick up an older OptiPNG version accidentally from somewhere else in your $PATH?

[kevva]

Do you have OptiPNG installed globally?

[binarykitchen]

Thanks guys for your comments. Hmmm, with the new version 0.6.0 I get a new error:

Fatal error: Cannot find module 'pngquant-bin'

[binarykitchen]

Also, I found in another grunt task for JPG files only that any JPG file becomes corrupted :(

[binarykitchen]

@kevva No, I do not have OptiPNG installed globally