Who understand bilinear interpolation for reducing image size?

On 12-12-2014, at 3:04 AM, Bert Freudenberg <[hidden email]> wrote:

> On 12.12.2014, at 04:47, tim Rowledge <[hidden email]> wrote:
>>
>> monkey1.png where the background should be transparent but appears as white -https://copy.com/lgAtv9rDlTGaGb9m
>> bananas1.png (similar but different in detail) - https://copy.com/Vsj8lgqtyQmwIerA
>
> Both work fine if I simply drop them into a 4.5 image. I can move/rotate/scale no problem. Shadow rendering is not nice, but that's a problem of the shadow renderer, not the bitmap itself.

Sigh. It looks ok when used that way because the process makes a SketchMorph which draws by use of blending. Which is pretty much exactly what I said, though possibly rather long-windedly. Scratch has to use paint. Well, it could of course be changed to use blend but as previously explained that has a risk of messing up old projects and costing too much time on slower machines.

OK, I give up.

tim
--
tim Rowledge; [hidden email]; http://www.rowledge.org/tim
How do I set my laser printer on stun?

So, does my fix work for you?

Cheers,
Juan Vuletich

Quoting karl ramberg <[hidden email]>:

There seem to be is some issues in Trunk on conversion between 32 bit and 16 bit display depth. Changing display depth shows the issue.

When I open the monkey1.png it has transparent pixels in 32 bit but opaque white in 16.

 

 

 

Karl

On Fri, Dec 12, 2014 at 8:09 PM, tim Rowledge <[hidden email]> wrote:

On 12-12-2014, at 3:04 AM, Bert Freudenberg <[hidden email]> wrote:

> On 12.12.2014, at 04:47, tim Rowledge <[hidden email]> wrote:
>>
>> monkey1.png where the background should be transparent but appears as white -https://copy.com/lgAtv9rDlTGaGb9m
>> bananas1.png (similar but different in detail) - https://copy.com/Vsj8lgqtyQmwIerA
>
> Both work fine if I simply drop them into a 4.5 image. I can move/rotate/scale no problem. Shadow rendering is not nice, but that's a problem of the shadow renderer, not the bitmap itself.

Sigh. It looks ok when used that way because the process makes a SketchMorph which draws by use of blending. Which is pretty much exactly what I said, though possibly rather long-windedly. Scratch has to use paint. Well, it could of course be changed to use blend but as previously explained that has a risk of messing up old projects and costing too much time on slower machines.

OK, I give up.

tim
--
tim Rowledge; [hidden email]; http://www.rowledge.org/tim
How do I set my laser printer on stun?