Metadata for PNG format

Is there anyway to retain the Metadata when saving a file from .PSD to .PNG? I get a warning saying the file has to be saved as a copy, and then metadata is gone.
Mac 10.6.8

Adobe Photoshop engineers have commented on this over the years.
PNG is not viewed by Adobe as a working format, just an end-product or final-output format.
For example:
http://forums.adobe.com/message/4000022#4000022
PSD files support layers and more metadata than PNG.
PNG is not a working format, but something you export to when you're done with all your edits, similar to JPEG or GIF.
and
http://forums.adobe.com/message/1205501#1205501
Unfortunately, PNG has only minimal (and confused) metadata standards.
You can tag it within an application, but the application doesn't have a standard way of putting the metadata into the file.
There will be more hits if you do a forum search and add Chris Cox as keywords to your PNG metadata search.
A thing to remember is that web sites very often will convert PNGs to JPEGs and do it very badly, beside stripping metadata.

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source code
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Iterator;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.metadata.IIOMetadataNode;
import javax.imageio.stream.ImageOutputStream;
import org.w3c.dom.Node;
import com.sun.image.codec.jpeg.ImageFormatException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class TestImage {
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Hi,
I am having similar problems. I have read somewhere that png format can not handle CMYK colorspace anyway, which I find odd (and plainly stupid IM(NS)HO) which would mean that converting to RGB and therefore using profiles is mandatory.
May be you should check if the internal format of the png files claims it is RGB or CMYK (using ImageMagick's "identify" command for example).
HTH
JG

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hedger,
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BOILERPLATE TEXT:
Note that this is boilerplate text.
If you give complete and detailed information about your setup and the issue at hand,
such as your platform (Mac or Win),
exact versions of your OS, of Photoshop (not just "CS6", but something like CS6v.13.0.6) and of Bridge,
your settings in Photoshop > Preference > Performance
the type of file you were working on,
machine specs, such as total installed RAM, scratch file HDs, total available HD space, video card specs, including total VRAM installed,
what troubleshooting steps you have taken so far,
what error message(s) you receive,
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etc.,
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http://forums.adobe.com/thread/419981?tstart=0
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smbrannan
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Easy, safe, and only takes a minute or two.
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Metadata for PNG format

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