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DarkBASIC Professional Discussion / save image bugged?

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TheComet
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Location: I`m under ur bridge eating ur goatz.
Posted: 1st Sep 2010 21:55
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Hi all

Well, why does save image always save to a resolution of 128x256, even though the image size is 640x480? Is this a bug? How can I fix this?

TheComet

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HowDo
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Location: United Kingdom
Posted: 1st Sep 2010 22:14
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well it would have been nice to have some code to play with to see how your are doing it.

Dark Physics makes any hot drink go cold.
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TheComet
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Posted: 1st Sep 2010 23:02
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Of course you can have some code Sorry I forgot about that

This creates a 640x480 image, but saves it to a 1024,512... Why is that?



TheComet

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Sven B
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Posted: 1st Sep 2010 23:04
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Try changing
get image 1,0,0,640,480
to
get image 1, 0, 0, 640, 480, 1

Cheers!
Sven B

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TheComet
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Posted: 1st Sep 2010 23:09
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Aaaah, thank you so much Sven B It worked perfectly! Why is it that I trip over the simplest problems?

TheComet

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Green Gandalf
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Playing: Malevolence:Sword of Ahkranox, Skyrim, Civ6.
Posted: 1st Sep 2010 23:11
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Quote: "This creates a 640x480 image, but saves it to a 1024,512... Why is that?"


That's very different from 128x256 which is what you said earlier. You'd have got the right answer straightaway if you'd got that detail right at the beginning.

Sven B has given you the answer.
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Sven B
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Posted: 1st Sep 2010 23:26 Edited at: 1st Sep 2010 23:27
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Quote: "128x256"


Just being a power of 2 was enough for me to trigger my suspicion of get image though... I didn't read his second post.
Still, Green Gandalf is right. You might want to go into more detail for faster reply with a solution.

Cheers!
Sven

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TheComet
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Posted: 2nd Sep 2010 08:39
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Yeah, I got some things mixed up... This is what I found out:

With a 80x60 image, it saved to a 128x64
With a 160x120 image, it saved to a 256x128
With a 320x240 image, it saved to a 512x256
With a 640x480 image, it saved to a 1024x512

Very strange... It seems it takes the largest axis, and finds the next greater axis that is an exponent of 2, where the y axis is always half of the x axis, but both axises are greater than the image dimensions.

But it works now thanks to a simple flag

TheComet

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Sven B
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Posted: 2nd Sep 2010 15:25
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Quote: "Very strange... It seems it takes the largest axis, and finds the next greater axis that is an exponent of 2, where the y axis is always half of the x axis, but both axises are greater than the image dimensions."


Actually, it just scales each dimension up to the first power of 2.

Sven B

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Alien Menace
AGK Developer
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Posted: 10th Sep 2010 17:55
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You fix it by setting the texture flag to 1 but does anybody know why it does this to begin with? What logic would be behind that kind of default behavior?

Intel Core Duo2 E6850 3.0 GHz - 2x Geforce 8800 GTS SLI - 6GB RAM - Creative X-FI - Windows 7 64-bit.
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Sven B
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Posted: 10th Sep 2010 18:04
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Hi Alien,

Some hardware requires images whose dimensions are a power of 2. So it's hardware-related.

Cheers!
Sven B

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