Could you point a good "free" software to reduce a big PNG Picture without lost of quality?

Hi Experts!

Could you point a good "free" software to  reduce a big PNG Picture  without lost of quality?

I reduced it to 2% of the original dimensions and paintbrush but it advised me of the lost of quality (lost of transparency)

Thanks in advance!
Eduardo FuerteDeveloper and AnalystAsked:
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Dan CraciunIT ConsultantCommented:
The PNGs only have a lossless compression.
You can't reduce the size without reducing the details: number of colors, size or transparency.

HTH,
Dan
strungCommented:
If you reduce the size of an image you always lose quality.

Exactly what are you trying to accomplish by reducing it in size? Change the print size? Change the display size? Change the file size?
Eduardo FuerteDeveloper and AnalystAuthor Commented:
Hello

What I need is reduce a very large image to an icon dimensions to use in a site.

img_001
What I had after reduccion using Paintbrush.
img_002
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strungCommented:
So what is the problem? The small icon looks good to me.
Dan CraciunIT ConsultantCommented:
Here is the image reduced, with transparency included.
reduced image
Eduardo FuerteDeveloper and AnalystAuthor Commented:
Ok... so, no diferences between.
Good to have your opinions.
Dan CraciunIT ConsultantCommented:
The difference is that your reduced image is 4KB and mine is 1KB, with transparency intact.

The only free software that I know that can do that is the GIMP, but you're in for a steep learning curve.
Eduardo FuerteDeveloper and AnalystAuthor Commented:
By using Paintbrush?

How to reduce the image in Kb  ? (I used percentage)
Dan CraciunIT ConsultantCommented:
No, not using Paintbrush.
I used Photoshop, but you can do it in GIMP also.
Joe Winograd, Fellow&MVEDeveloperCommented:
If you want to experiment with excellent (free!) imaging software, I recommend GraphicsMagick. These two EE articles show how to download, install, and use it:

Create a PDF file with Contact Sheets (montage of thumbnails) for all JPG files in a folder and each of its subfolders using an automated, batch method

Create an image (BMP, GIF, JPG, PNG, TIF, etc.) from a multi-page PDF

You would use a call like this:

gm convert input.png -quality 50 -geometry 1920x1080 output.png

Here are the details of the convert operation:
http://www.graphicsmagick.org/convert.html

Note that the -quality parameter is a number between 0 and 100 and the -geometry parameter is width-by-height in pixels. Btw, your original image is 1819x1213, while your reduced image is 55x37.

Other excellent (free!) software that can resize images are GIMP, ImageMagick, IrfanView, and paint.net (among many others). Regards, Joe

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_TAD_Commented:
I think you will want a tool like Paint.Net

free, open source, and pretty full featured

http://www.getpaint.net/download.html
Eduardo FuerteDeveloper and AnalystAuthor Commented:
Thanks for the assistance!
Joe Winograd, Fellow&MVEDeveloperCommented:
You're welcome! Happy to help. Regards, Joe
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