PNG files

[vafa]

Call for technical help please:
How can I upload my photos from camera to PC in PNG format?
Vafa

[evilenglishman]

your camera doesn't take images in png format

[nomel]

If you want to be able to upload and download files other than what the picture took, you should get a compact flash card reader.

[Jesper]

Call for technical help please:
How can I upload my photos from camera to PC in PNG format?
Vafa
You can't. Your camera probably takes images in JPEG format. Once you've transferred the JPEG files from your camera to your PC, you'll need to convert them with software on the PC if you want them in PNG format.

[stopbath]

You can only upload to the computer in a format that the camera generates. (RAW, TIFF, JPEG are likely formats)

If your camera supports generating PNG (?), then select it, and yer all set.

Most cameras will support JPEG or RAW, so select one, then upload to the computer, and then convert to a new file format. The files uploaded are the archival copies. All conversions or editing should result in a COPY of the original (never replace the original file with a new one.) You should always be able to "go back" to the original camera file, and start over.

[vafa]

Thanks all for your comments.
May I convert the RAW file to PNG format without losing the qulity comparing to an original PNG photo?
vafa

[nomel]

png is like jpeg, but without loss in image data like jpegs and other "lossy" compressions use.

raw is more of a different beast.

Raw is the raw ccd data. ccd's don't return the rgb color value for each "pixel" since the points they detect are single red green and blue detectors in a non rgb pattern (such as a monitor and whatnot). This is why interpolation must be used (which causes moire effect and whatnot), to get them to single pixels with a certain color. So, to get a png, you must figure out how all of the colors from the detectors will combine to make a single color value at some point. This can be done different ways, applying different algorithms, or amounts of sharpenning, contrast, white balance and whatnot.

since png must be made with this interpolated data from the ccd, you have to use a set amount of contrast, sharpness, etc to make the png. So, now that you have your png, if you adjust sharpness, contrast, white balance, and whatnot, you are working off of the data that was made using a set contrast, sharpness, etc when you made the png. Obviously, this would mean data would become innacurate/lost/gained. So, you couldn't have the same accuracy/quality of a raw since you cannot modify the way the color data is created, only the already created data.

added:
png does go to 48-bits per pixel, or, 16 bits per r, g, and b color channel, so, I believe it could keep up with raw for color depth. but, you loose the ability to change what color value the ccd data creates.

and, i'm assuming you mean when comparing to the original *RAW* photo.