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Author Topic: OLD Digiview Format to be converted.  (Read 4241 times)

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Offline amigaksi

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Re: OLD Digiview Format to be converted.
« Reply #14 from previous page: July 31, 2008, 09:05:07 PM »
>poo pooing on jpg format is inane. There is a time and a place for jpg, and obviously you don't do multiple edits on that format. It's also obvious you don't convert low color images to that format if you want it to look good.

The general consumer does not know the technical details of where to avoid JPGs.  I have seen some medical people using JPGs of medical imagery.

>Consumer cameras save to jpg because people can't see the difference in their pictures between raw because consumer cams don't have the quality for raw to make a difference anyway.

Yes, they do.  It's better to have a digital camera save to lossless format than lossy JPG.  There was a time and place when you couldn't because memory was expensive, but now they should avoid lossy algorithms.  Most consumers can't tell the difference between an 800*600 image interpolated to 1024*768 and an original 1024*768 but still the 1024*768 is better.

>Obviously you do your editing in a lossless format, and when you're done you publish in a lossy format unless your image is line art, screen shots or low color pix of crap you scraped off your amiga.

Some things don't require 24-bit RGB like cartoons or even hand-done paintings but that does not make them "crap".  

>That pic of the beach during sunset is going to look the same to people whether it's a tiff or a jpg, most of human vision is stuff being just plain made up in the viewers brain. This is why people use JPG, the result is about the same and it takes up a lot less bandwidth.

That same sunset in 24-bit lossless compressed format is better than JPG.  Would you archive a Mona Lisa in JPG or lossless compression?  And you can also subsample the color space 4:1 in each axes and interpolate it with luminance and get an image which human vision can hardly distinguish from the original.  And if you can losslessly compress the luminance and chrominance after delta-modulation, you get more than 8:1 compression easily and you know exactly what you have lost rather than doing a discrete cosine transform and quantizing the coefficients and not knowing what you lost in the spatial domain.

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Offline Tenacious

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Re: OLD Digiview Format to be converted.
« Reply #15 on: August 01, 2008, 02:50:16 AM »
@ Rowbeartoe

I'm a little unclear of your intentions.  Are you going to upload the images in their original format or after you have converted them to the format of your choice?

Amiga.org may or may not want the original formats but the original images (if not the demo disks) should be preserved somewhere.
 

Offline RowbeartoeTopic starter

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Re: OLD Digiview Format to be converted.
« Reply #16 on: August 02, 2008, 07:47:23 PM »
I'm going to upload them in PNG format.  Unless I'm mistaken this should keep the pictures looking identicle?  I will be uploading my NewTek collection soon.  Another request I was asked for recently was a Sachs collection in the original formats.  Most of mine are in GIF format.  Can anyone make a Sachs collection?

Thanks EVERYONE and great topic about JPG too!  =)
 

Offline RowbeartoeTopic starter

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Re: OLD Digiview Format to be converted.
« Reply #17 on: August 02, 2008, 09:04:40 PM »
http://www.atari-forum.com/viewtopic.php?f=80&t=14448

The above link is to an Atar ST Forum that I used to upload the NewTek collection of Amiga pictures in PNG format.  I had a hard time uploading them to Aminet- so perhaps someone here can upload them with better success than I had.

It's a great collection with pictures ranging from 320x200 HAM6 to overscan highres 4096 color dynamic HiRes.  1986-1990.  All pictures could be displayed on the Original Amiga OSC.  =)

Thanks everyone for your help.  =)