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Before the rush
by evan-pak

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For questions about the image file format

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51
votes
7answers
12k views

Why don't most cameras support PNG format?

I prefer PNG format to JPG, because JPG uses lossy compression. When I capture a screen in my PC or scan a picture or document in my scanner, I always save them as PNG format. If a camera could ...
15
votes
3answers
16k views

Is TIFF really of higher quality than PNG-24?

I've been doing some research to try to figure out why more people do not store high-resolution image files as PNG-24. PNG has exactly-reversible, lossless compression, it is a net-friendly format so ...
15
votes
5answers
6k views

How do I go about editing the metadata of a PNG file?

How do I go about editing the metadata of a PNG file? Is there some free software I can use? Thanks in advance.
7
votes
4answers
32k views

How to batch process images retaining them as PNG in Photoshop?

I need to optimize 700 images in PNG in a batch process, but Photoshop only gives me the option to optimize the images and export them to JPG, when I want to mantain the images on PNG. Is there a way ...
2
votes
4answers
8k views

Difference between PNG and RAW, other than compression?

I know that many professional cameras shoot in RAW. PNG has lossless compression which would allow cameras to save more shots than RAW. This leads me to wonder if there's anything special about RAW ...
2
votes
2answers
1k views

Is “Date Taken” Exif data possible on .PNG file, and is it possible to copy “Date Modified” to “Date Taken”?

I want to change the Exif data for some .PNG files so that they have the "Date Taken" tag. Is it possible to use that tag on .PNG files? Is it possible to copy the "Date Modified" date to the "Date ...
2
votes
2answers
176 views

How to add author and other properties to png files?

I am on Windows 7 and I cant find how to add the author or any other properties for a png file I created. The only thing I can modify is the shooting time which I dont need. I have searched the entire ...
2
votes
1answer
222 views

If PNG is Lossless Why Does Difference Blending Mode Show a Difference

I often read that PNG is a lossless format so I decided to do a little experiment to try to prove it. In Photoshop I did Save for Web to PNG-24. Then, I did File->Place to open the PNG and import it ...
2
votes
2answers
6k views

Does a .png file extension on an iPhone image mean that the photo was edited or altered in any way?

I've been told that a photo I took with an iPhone has a .png extension means that the photo has been altered or tampered with. I know I took the pic at that time. Why are some of my photos in the ....
2
votes
2answers
575 views

PSE10 Insert Invisible Watermark

I need to put an invisible watermark in some of my PSE10 edited PNG files, but since I am an amateur, I probably don't need an online subscription right now. How do I easily put an invisible ...
1
vote
2answers
402 views

Why doesn't PNG show more detail than JPEG in a converted NASA image?

I have a really limited knowledge of photography, so, bearing that in mind, here is my problem. I downloaded an IMG file with a separate label file from NASA PDS because I wanted to visualise the ...
0
votes
1answer
152 views

What is this format? PNG unreadable by browser [closed]

I got an image, that is supposed to be PNG, but alot of applications can't read it (Windows itself can)... for example Paint Shop Pro says it is incorrect PNG, Chrome or Opera are not reading it ...
-2
votes
1answer
129 views

Remove all metadata from PNG, commandline [closed]

I'm trying to create really small PNG thumbnails from JPGs using GraphicsMagick. gm convert coolphoto.jpg -resize 16x16 -colors 6 coolphoto_16x16_6color.png These get down to 342 bytes, but they ...