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johngill
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Joined: 22/09/2020
Location: United Kingdom
Posts: 38

Posted: 05:23pm 19 Apr 2021

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Hi all,

I'm trying to make a 640x400 png tilesheet for my game. I'm using corel Photopaint to export a 24 bit png with a transparent background, and it looks like this on the PC:

I've positioned 7 16x16 graphics in the top left hand corner of the sheet, and that's all it is.

But when I load it up on my CMM2, it goes absolutely bananas:

no kidding - this is exactly the same .png file.

Have I done something dumb? Is photopaint somehow exporting the "transparentness" of the png in a weird way? What can I do to fix it?! Help!

thanks in advance

John

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10600

Posted: 05:26pm 19 Apr 2021

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If you post the png file (zip it up) then we can have a look

johngill
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Joined: 22/09/2020
Location: United Kingdom
Posts: 38

Posted: 06:02pm 19 Apr 2021

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matherp said If you post the png file (zip it up) then we can have a look

now why didn't I think of that.... this is why you're in charge and I'm not ;-)

zipped up png file attached.

tilesheet2test.zip

thanks

johngill
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Joined: 22/09/2020
Location: United Kingdom
Posts: 38

Posted: 06:33pm 19 Apr 2021

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PS... I'm currently running on 5.07.00 beta 19

matherp
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Posted: 06:56pm 19 Apr 2021

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Don't know what the problem is but I've just saved as a png using a different program (Very old copy of PaintShopPro) and now it works. I assume corel is using some feature that isn't supported by the CMM2

tilesheet2test.zip

johngill
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Joined: 22/09/2020
Location: United Kingdom
Posts: 38

Posted: 08:31am 20 Apr 2021

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matherp said Don't know what the problem is but I've just saved as a png using a different program (Very old copy of PaintShopPro) and now it works. I assume corel is using some feature that isn't supported by the CMM2

Thanks so much for looking into this - I think I need to get my hands on a very old copy of PaintShopPro :-)

I've loaded it up on my CMM2 as follows:

mode 8,12,rgb(80,80,80)
page write 3
load png "tilesheet2test.png"
page write 0
page copy 3 to 0

Sorry if it's just me being dim, but this doesn't seem to preserve the transparent background of the png - the black areas of the png are solid black rather than showing through to the rgb(80,80,80) background underneath...?

When I try opening the png up in photopaint, it shows the transparent background fine.

Any ideas???

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10600

Posted: 08:54am 20 Apr 2021

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You need to specify the transparency cut off parameter

Try

load png "tilesheet2test.png",0,0,7

Edited 2021-04-20 18:55 by matherp

johngill
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Joined: 22/09/2020
Location: United Kingdom
Posts: 38

Posted: 09:29am 20 Apr 2021

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thought it might be me... many thanks again

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