Convert PNG 24bit to PNG 8bit

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ejovrh2
Posts: 2
Joined: Wed Sep 21, 2016 8:41 am

Convert PNG 24bit to PNG 8bit

Postby ejovrh2 » Wed Sep 21, 2016 8:57 am

Hi all,

Why I need to convert? I have 60 GB files in folders and subfolders and I want to shrink amount of data. Lose of quality is not important.
I try with ImageMagick but didn't succeeded.
Is it possible with XnConvert? At Output Tab I can change Format but I don't understand Settings Tab below Format picker...
Please give me some hint.

Thanks in advance

Newbie

cday
XnThusiast
Posts: 1534
Joined: Sun Apr 29, 2012 9:45 am
Location: Cheltenham, U.K.

Re: Convert PNG 24bit to PNG 8bit

Postby cday » Wed Sep 21, 2016 9:27 am

ejovrh2 wrote:I have 60 GB files in folders and subfolders and I want to shrink amount of data. Lose of quality is not important.

If you wish to reduce the file size of your PNGs the first thing to try would be to check that you have maximum compression selected: on the Output tab set the format to PNG and then click on the Settings... button and set Compression level = 9.

If you wish to try converting the files to PNG 8 bit you can use Image > Change color depth on the Actions tab.

But if quality loss is not important, have you considered saving the images as JPEG files with compression applied?

If you need further help do you have a sample image you could upload?

ejovrh2
Posts: 2
Joined: Wed Sep 21, 2016 8:41 am

Re: Convert PNG 24bit to PNG 8bit

Postby ejovrh2 » Wed Sep 21, 2016 9:45 am

Thanks for fast replay cday.

Used Image > Change color depth on the Actions tab and I am very satisfied.
Compression level=9 shrink data just for 2%.

I don't need further help.

I can't change extension (it is not necessary) because pictures are downloaded from wms server as tiles.

Very cool program XnConvert.


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