Does downscaling actually decrease resolution?

cyril42e

111
SD1000/Ixus70 1.02a

Re: Does downscaling actually decrease resolution?

« Reply #20 on: 28 / July / 2008, 12:06:40 »

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Quote from: LjL on 28 / July / 2008, 08:42:32

[PNG's DEFLATE compression method] is combined with prediction

Oh, then ok, I didn't know that, my apologies. I should have refreshed my knowledge of the topic before talking

.

Do you want to just compress raw files so that they are smaller, with eg a specific program on your computer to uncompress them, or do *real* lossless jpeg with *real* dng and all the format constraints to be compatible with generic software? I think there is more work to respect all the standards than to actually implement a compression algorithm, and I hate that part

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LjL

266
A720IS

Re: Does downscaling actually decrease resolution?

« Reply #21 on: 28 / July / 2008, 14:17:51 »

Actually, I've already started writing to code to output hopefully proper CRW. With no compression though, as of yet, but I was planning to implement the proper format, if it's not just too much of a hassle.

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true

35
SX230, SX260, 5DmkII, and more :)

Re: Does downscaling actually decrease resolution?

« Reply #22 on: 28 / July / 2008, 20:22:29 »

A CIFF-compliant RAW writer would be absolutely welcome, LjL. I could care less if it's compressed (I guess my always-available storage capacity in the home for a relatively poor guy isn't being used up enough).

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Canon P&S: 110HS, SX260HS, SX230HS, 2x A720 IS, 2x A590 IS
Canon DSLR: 5D Mark II, 300D IR-converted, 8x glass
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