The Pawn is back. And it's not alone!

Anything QL Software or Programming Related.
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BSJR
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Re: The Pawn is back. And it's not alone!

Postby BSJR » Sun Nov 17, 2019 3:54 pm

tofro wrote:
Andrew wrote:The same Guru - dithered "by hand" in Photoshop, scaled for QL pixel ratio and loaded in QPC mode 8


Impressive.
Do you know by any chance what algorithm for dithering Photoshop is using?

And could you try to do the same thing to the jinxter bus picture?

Hi Tofro,

You might want to take a look at Ungif. http://www.dilwyn.me.uk/graphics/ungif.zip
It does dithering in mode 4 and 8 and runs on any QL but was used here on QPC2 in mode 8 to make this example.
A DO on the converted image opens a menu to change settings and redo the image.
This size is 512x256, but it can be adjusted to trim the automatic border later.
[img]
CoyoteM8.png
[/img]
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CoyoteM8.png


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Andrew
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Re: The Pawn is back. And it's not alone!

Postby Andrew » Sun Nov 17, 2019 4:55 pm

tofro wrote:
Andrew wrote:The same Guru - dithered "by hand" in Photoshop, scaled for QL pixel ratio and loaded in QPC mode 8


Impressive.
Do you know by any chance what algorithm for dithering Photoshop is using?

And could you try to do the same thing to the jinxter bus picture?

Photoshop uses a modified Floyd-Steinberg algorithm - but in our case it doesn't work good when applied to the whole picture.
What i did was: i raised the contrast to maximum then i proportionally scaled the photo to 341x256 to compensate for the different x and y sizes of QL pixels (I also had to add some black to left and right for this) . Then i scaled it to 256x256, reducing only the width. Then i separated the guru from the background and applied a 70% dithering on him. The background was modified by hand, using some patterns and brushes that i created for PI Cole game.

I can do the same for the jinxter bus picture, if you send it to me.
Last edited by Andrew on Sun Nov 17, 2019 9:40 pm, edited 1 time in total.


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Re: The Pawn is back. And it's not alone!

Postby Derek_Stewart » Sun Nov 17, 2019 9:06 pm

BSJR wrote:You might want to take a look at Ungif. http://www.dilwyn.me.uk/graphics/ungif.zip
It does dithering in mode 4 and 8 and runs on any QL but was used here on QPC2 in mode 8 to make this example.
A DO on the converted image opens a menu to change settings and redo the image.
This size is 512x256, but it can be adjusted to trim the automatic border later.
[img]CoyoteM8.png[/img]

Hi,

ungif is quite old now, maybe if it was disassembled, it could be updated. I will have a look at this.

But can Photon not do most this???


Regards,

Derek
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mk79
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Re: The Pawn is back. And it's not alone!

Postby mk79 » Sun Nov 17, 2019 11:11 pm

First of all, cool work Tobias, well done!

I am leaning towards not applying any dithering at all at the moment, even if that means some details is lost.
Seconded, even if in the first picture he looks like he ate too many jalapenos it looks much better in my eyes.

Cheers, Marcel


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Re: The Pawn is back. And it's not alone!

Postby tofro » Mon Nov 18, 2019 7:02 am

While the hand-optimized pictures look all fine and dandy (and could possibly end up with a much better quality as shown), anything that requires the graphics files to be converted up-front, would, unfortunately, also require distributing these converted graphics - as this is not possible due to the legal situation explained above, I'm afraid this is not the way to go, at least until this situation resolves.

I will stick with the straight on-the-fly colour conversion for the moment. And might be looking into the dithvide approach further on.

Tobias


ʎɐqǝ ɯoɹɟ ǝq oʇ ƃuᴉoƃ ʇou sᴉ pɹɐoqʎǝʞ ʇxǝu ʎɯ 'ɹɐǝp ɥO
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Re: The Pawn is back. And it's not alone!

Postby Peter » Mon Nov 18, 2019 9:57 am

Would the availability of an afforable SGC successor with decent graphics help software developments like this?
In the sense that, instead of struggling with 8 colors, the software developer could just say "get yourself a 99 £ card for the QL if you want it to look good"?

Or is the software work for MODE 8 mainly fun & challenge, not calling for BBQL hardware upgrades?


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Re: The Pawn is back. And it's not alone!

Postby tofro » Sat Nov 30, 2019 11:41 pm

How's this?

IMG_0947.JPG


(Mr. Guru rendered as an interlaced picture - 57 colors - using the dithvide method. Otherwise not modified from original)

Still needs a bit of tweaking, apparently. But much better already, I think.

The method is actually much easier than I first thought. And My monitors get only lightly annoyed with this method.

Tobias


ʎɐqǝ ɯoɹɟ ǝq oʇ ƃuᴉoƃ ʇou sᴉ pɹɐoqʎǝʞ ʇxǝu ʎɯ 'ɹɐǝp ɥO
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Re: The Pawn is back. And it's not alone!

Postby tofro » Tue Dec 03, 2019 11:00 pm

Slowly, but steadily, we seem to be gettting somewhere:

IMG_0956.JPG


IMG_0955.JPG


IMG_0954.JPG


Unfortunately, I still have this annoying flickering mentioned in the other thread. I put a delay loop into my keyboard loop, which improved things a bit, but the issue is still there. Today, I have not tested on a real CRT, so it might also be caused by the upscaler.

The horizontal stripes that appear in the picture are not visible in reality - apparently interference with camera exposure time (excuse the crappy pictures taken with my phone)
Last edited by tofro on Tue Dec 03, 2019 11:09 pm, edited 3 times in total.


ʎɐqǝ ɯoɹɟ ǝq oʇ ƃuᴉoƃ ʇou sᴉ pɹɐoqʎǝʞ ʇxǝu ʎɯ 'ɹɐǝp ɥO
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Re: The Pawn is back. And it's not alone!

Postby tofro » Tue Dec 03, 2019 11:03 pm

And some more QL "MODE8i" pictures from MS adventures:

IMG_0953.JPG


Mr. Guru seems to have at least partially recovered from his Jalapeño issue...

IMG_0952.JPG


I think that doesn't look too bad for a QL in MODE 8.
I also have one or the other crash/hang when displaying pictures. Needs a bit more fiddling

Tobias


ʎɐqǝ ɯoɹɟ ǝq oʇ ƃuᴉoƃ ʇou sᴉ pɹɐoqʎǝʞ ʇxǝu ʎɯ 'ɹɐǝp ɥO
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Re: The Pawn is back. And it's not alone!

Postby vanpeebles » Wed Dec 04, 2019 8:26 am

Great progress :)



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