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On 27/11/14 14:10, Stephen wrote:
>
> The stews, again?
>
How well you know me, young man :-p
John
--
Protect the Earth
It was not given to you by your parents
You hold it in trust for your children
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On 28/11/2014 20:58, Doctor John wrote:
> On 27/11/14 14:10, Stephen wrote:
>>
>> The stews, again?
>>
>
> How well you know me, young man :-p
>
I didn't until you admitted it. :-P
--
Regards
Stephen
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On 28-11-2014 20:16, Bald Eagle wrote:
> Thomas de Groot <tho### [at] degroot org> wrote:
>> On 27-11-2014 11:55, Stephen wrote:
>>
>>> Be careful. Once you start looking at old scenes. You will find
>>> something else that wants improving. Never ending.
>>> I noticed that some of my earth maps go back to 98 (when I downloaded
>>> them) and the ones I normally use are from 2008. So I downloaded some of
>>> the Blue Marble ones. Now the Nautilus model does not fit in with the
>>> Earth . I will need to rework its textures.
>>>
>>>
>> I know. It is a difficult to resist temptation.
>>
>> Thomas
>
> Having fun and "resting" my brain scrolling through
> https://www.google.co.uk/search?q=site:news.povray.org&tbm=isch
>
> and I came across this:
>
>
http://news.povray.org/povray.binaries.images/attachment/%3C43e348c8%40news.povray.org%3E/Alien%20Cliff.jpg?ttop=284089
> &toff=1600
>
> Which instantly meshed with a scene in the book I'm (finally) reading - "Against
> All Things Ending" by Stephen Donaldson, where Linden Avery beholds Landsdrop:
>
> "And she caught sight of Landsdrop. Grey in the depthless sunlight, it loomed
> two thousand feet and more above her own elevation: a blunt rampart smoothed by
> the ages until it appeared almost blank; too sheer to scale. But she knew from
> old experience as well as from tales that Landsdrop was more accessible than it
> looked. There were trails of all kinds up and down the precipice, although she
> could not descry them at this distance. Ignoring the impatience of the Ranyhyn,
> Linden studied the vista. Almost directly to the west, a thin string of water
> fell as though it had been tossed over the rim by a negligent hand. Dull against
> the dim stone, like a strand of tarnished silver, it dropped in stages, shifting
> from side to side as its plunge encountered obstacles, and casting fine hints of
> spray into the etiolated sunshine."
>
And yet, it was not inspired by Donaldson... :-) It was by another SF
world: Mount Lookitthat on Plateau, imagined by Larry Niven. The concept
then drifted slowly away from there to the present image.
Thomas
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On 28-11-2014 13:24, clipka wrote:
> A) 16-bit png images with alpha channel.
>
Which reminds me: Using IC, how can one convert an 8-bit png into a
16-bit png? I suppose the image needs to be resampled but with what
settings?
Thomas
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Le 14-11-29 07:18, Thomas de Groot a écrit :
> On 28-11-2014 13:24, clipka wrote:
>> A) 16-bit png images with alpha channel.
>>
>
> Which reminds me: Using IC, how can one convert an 8-bit png into a
> 16-bit png? I suppose the image needs to be resampled but with what
> settings?
>
> Thomas
>
>
Using most image procesing tools supporting saving PNG with multiple bit
per channel:
Load the original image whitch can be in any format, not just PNG.
Save it as a 16 bit per channel PNG file.
The only thing been that the lower 8 bits will be patched with zeros.
This may be aleviated by enlarging the image and bluring the enlarged
version. This may force some interpolation between the original pixels.
Far from perfect, but beter than nothing.
If you can render the image in POV-Ray, add +fn16 to the command line to
create the image as a 16 bit per channel PNG.
You may try rendering the original image as an image_map of at least
twice the pixel size of the original and use one of the interpolation
methods.
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Am 29.11.2014 13:18, schrieb Thomas de Groot:
> On 28-11-2014 13:24, clipka wrote:
>> A) 16-bit png images with alpha channel.
>>
>
> Which reminds me: Using IC, how can one convert an 8-bit png into a
> 16-bit png? I suppose the image needs to be resampled but with what
> settings?
>
> Thomas
>
>
image->mode->16bps
then save as PNG
this makes only sense if you are going to resize, tonemap, filter, do
*anything* with the image afterwards.
-Ive
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Am 30.11.2014 01:44, schrieb Alain:
> The only thing been that the lower 8 bits will be patched with zeros.
err, no, any decent image processing tool will multiply by 257 instead a
simple left-shift.
-Ive
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On 30-11-2014 11:42, Ive wrote:
> Am 29.11.2014 13:18, schrieb Thomas de Groot:
>> On 28-11-2014 13:24, clipka wrote:
>>> A) 16-bit png images with alpha channel.
>>>
>>
>> Which reminds me: Using IC, how can one convert an 8-bit png into a
>> 16-bit png? I suppose the image needs to be resampled but with what
>> settings?
>>
>> Thomas
>>
>>
>
> image->mode->16bps
>
> then save as PNG
>
> this makes only sense if you are going to resize, tonemap, filter, do
> *anything* with the image afterwards.
>
> -Ive
Yes! You confirm what I suspected already (but was not sure). With only
using mode->16bps, nothing happens. Thanks indeed.
Thomas
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Le 14-11-30 05:47, Ive a écrit :
> Am 30.11.2014 01:44, schrieb Alain:
>> The only thing been that the lower 8 bits will be patched with zeros.
>
> err, no, any decent image processing tool will multiply by 257 instead a
> simple left-shift.
>
> -Ive
>
That 8 bits left shift or multiply by 256 is exactly the same as left
padding with zeros.
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Am 30.11.2014 19:09, schrieb Alain:
> Le 14-11-30 05:47, Ive a écrit :
>> Am 30.11.2014 01:44, schrieb Alain:
>>> The only thing been that the lower 8 bits will be patched with zeros.
>>
>> err, no, any decent image processing tool will multiply by 257 instead a
>> simple left-shift.
>>
>> -Ive
>>
> That 8 bits left shift or multiply by 256 is exactly the same as left
> padding with zeros.
257 != 256
-Ive
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