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Filtering pictures

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Filtering pictures

Postby gac » Tue Jan 11, 2005 4:49 pm

Hi !
Dont know if i should write my message in this topic but hey i am new
(ok, i am just lame :roll: , hmm)

I am upsizing (800x600 -> 1024x768) images and in ACDsee i can select resize filters. Does anyone know anything about next few filters:
bell, box, bicubic, b-spline, mitchell, lanczos, triangle.

Example: i know B-spline is derived through N convolutions of box filter B0, so B1 = B0 * B0, B2 = B0 * B1 = B0 * B0 * B0, ... The core (i think is also called kernel or something like that) is the same as bicubic core, that is

****
****
****
****

OK, that was xample :oops:

So, can you help me !?
Tnx, for your post, bye !
gac
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HSV nad HSL color depth

Postby gac » Fri Jan 14, 2005 10:01 am

Hi !

This has nothing to do with filtering pictures (just didnt wanna open new topic).

Can anyone tell me what color depths are in HSV / HSL color models ?
(just cant find it with google)

Example: RGB supports 1,4,8,15,24. 32 not supported.

Tnx for viewing and all posts.
gac
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Re: Filtering pictures

Postby HaraldHeim » Sun Jan 30, 2005 2:49 pm

gac wrote: I am upsizing (800x600 -> 1024x768) images and in ACDsee i can select resize filters. Does anyone know anything about next few filters: bell, box, bicubic, b-spline, mitchell, lanczos, triangle.


It depends on the implementation of these filters and on the used image, which ones produces the best results. From my experiences with other tools, I would say that bicubic, mitchell or lanczos will probably produce the best results. Just use all three and see which one produced the best result. Maybe you won't even see a real difference.

gac wrote: Can anyone tell me what color depths are in HSV / HSL color models ?


Color models aren't linked to certain color depths. You can have HSV/HSL in 8bit, 16bit or even 32bit color depths.
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Postby gac » Sun Jan 30, 2005 4:06 pm

Thank you for your help !
Have a nice day. :)
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Postby DanielSmith » Tue Mar 18, 2008 9:49 am

the diffenence bettween HSV and HSL can be found at http://www.acasystems.com/en/color-pick ... -color.htm
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