[Oberon] FW: BMP; was "FPGA - Screen.Mod"

[Skulski, Wojciech]

>Compression ratio seems 95%, but there is a lot of white space in the picture. 

That is the point. BMP seems to be a very wasteful format because it does not compress anything.

>Also it may come as odd to to see zipped JPEG

In my experience zipping JPEGs is not reducing their size. Also please note that saving a JPEG has many options. You can play with compression versus quality.

If you are exploring programming these things then perhaps you can look at the CPC collection. There are many outstanding programs there. AFAIK they deal with various graphics format. They also have the PAC compressor and subsystem which is reportedly one of the best compressors on the market. 

I find it lamentable that the Oberon has split from BlackBox Component Pascal to such a degree that CPC looks like a foreign land. I also find it lamentable that Oberon has not adopted Component Pascal as the standard, and even Oberon-2 is considered alien. 
Wojtek

________________________________________
From: Tomas Kral [thomas.kral at email.cz]
Sent: Thursday, September 21, 2017 8:18 AM
To: ETH Oberon and related systems
Cc: Skulski, Wojciech; paulreed at paddedcell.com
Subject: Re: [Oberon] FW:  BMP; was "FPGA - Screen.Mod"

On Thu, 21 Sep 2017 11:48:35 +0000
"Skulski, Wojciech" <skulski at pas.rochester.edu> wrote:

> Now look at the size of both files. PNG was 9 kB, the BMP is 203 kB

Compression ratio seems 95%, but there is a lot of white space in the
picture. I wonder what kind of compression PNG use?

The most complicated compression probably has JPEG, but it was
originally designed by photographers for photographers. Also it may
come as odd to to see zipped JPEG, as JPEG is already compressed
format.

--
Tomas Kral <thomas.kral at email.cz>