Some PNG images are not affected

[kozis]

Hello,
I found a problem with some PNG files. I have a many folders with PNG files and all of them are exported from photoshop by same method. But some of them are not affected by pngmin task. Do you know, where may be a problem? File "auto.png" (car) is ok, but "dum.png" (house) in same location is ignored. I tryied to rename it, crop and resave, but without success.
Thank You
Tom

[zauni]

Hi,
I will have a look into it! Thanks for the report.

[zauni]

I have tested now both pictures and both are getting minified... Can you post your gruntfile config for the pngmin task? Then I could try that config in my own machine. Thanks!

[kozis]

Hello, tanks for Your reply.
Here is a torso of project including Gruntfile.js:
https://app.box.com/s/lzd8avn41krn91p49hgu

[zauni]

Hello kozis,
thanks for the files! Now I probably know whats causing problems. It's the "quality" option.
In the docs: "Instructs pngquant to use the least amount of colors required to meet or exceed the max quality. If conversion results in quality below the min quality the image won't be saved and pngquant will exit with status code 99".
So propably with one of your pictures, it's below the min quality and it's not saving it. As a quick workaround you shouldn't use the quality option.

I will make a bugfix this week and publish it to npm as soon as possible.

Thanks again for your report and I hope it's not a big problem to leave the quality option for the moment!

[kozis]

Hello Zauni,
thanks for quick response. Workaround with quality option is working for me.
Pngmin is a very useful plugin and I like having it in our workflow. :)