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Questions tagged [png]

For questions about the image file format

1
vote
3answers
219 views

Printing digital photos: why do (most it seems) print shops only handle PDF not raster formats like PNG?

I am in Sydney, Australia. My otherwise very helpful local print shop only handles PDF (with limitations as described in this forum posting). I have so far not found any print shops in Sydney that ...
1
vote
1answer
46 views

Saving a isolate prop image with shadow to png

I'm shooting singular objects in studio and would like to save them isolated with their shadow information and a transparent background as a png. Is there a tutorial someone could point me to to do ...
2
votes
1answer
95 views

regarding image transfer [closed]

I have this client that is having a very frustrating time. I took some pictures for their clothing line. I formatted them for social media posting and copied them to a USB. I gave her the USB and for ...
1
vote
2answers
77 views

How to make Identical Images Of the Same Dimensions and Pixel Density Have Similar size [closed]

I have two images with the same dimensions. One is a facebook icon and the other is a plain white image. They are 32 bit, 128 pixels by 128 pixels, 96 pixels per inch and 3.39 cm but one is 1.87kb and ...
6
votes
3answers
1k views

Is it not ideal to save image as PNG for printing?

So the scenario: I want to order a print of one of my images. It is a special image and will be relatively large (a couple of metres) so I want it to be perfect as possible. I have the RAW file, ...
6
votes
2answers
1k views

Does converting image file formats affect quality?

Does converting image formats, such as from JPG to PNG, have any effect on image quality? I know converting from RAW to JPG has disadvantages, but what about other format conversions?
5
votes
2answers
8k views

How to add author and other properties to PNG files?

I am on Windows 7 and I can't 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 don't need. Why is this so? You can ...
1
vote
2answers
551 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 ...
-2
votes
1answer
1k 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 ...
6
votes
2answers
6k 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 ...
0
votes
1answer
351 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
317 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
14k 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 ....
4
votes
4answers
15k 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 ...
8
votes
5answers
63k 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
2answers
796 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 ...
19
votes
3answers
29k 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 ...
56
votes
7answers
18k 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 ...
18
votes
6answers
13k views

Ways to edit metadata of a PNG file?

How can I edit metadata of a PNG file? Is there some free software I can use?