PNG importing appears to be broken ( was Re: [squeak-dev] Who understand bilinear interpolation for reducing image size?)

J. Vuletich (mail lists) juanlists at jvuletich.org
Sun Dec 14 13:19:31 UTC 2014


  So, does my fix work for you?

Cheers,
Juan Vuletich

Quoting karl ramberg <karlramberg at gmail.com>:

> 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 <tim at rowledge.org>
wrote:
>> On 12-12-2014, at 3:04 AM, Bert Freudenberg <bert at freudenbergs.de>
wrote:
>>
>>> On 12.12.2014, at 04:47, tim Rowledge <tim at rowledge.org> 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; tim at rowledge.org; http://www.rowledge.org/tim
>> How do I set my laser printer on stun?
>>
>>  
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