Jupiter and Venus
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- Cosmic Lounger
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Re: Jupiter and Venus
Here's the top of Orion. Again not focussed well but the colour difference between Betelgeuse and Bellatrix is good!
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- Panoramic Lounger
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Re: Jupiter and Venus
Jupiter and Venus were clearly visible here in light polluted outer London (Photo taken with my phone pointing nearly directly at a street light)
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StuartR
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- PlutoniumLounger
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- Cosmic Lounger
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Re: Jupiter and Venus
The original was about 6Mb from my Canon 600D. I did a jpg save as with a 250kb limit in Irfanview.
How do you reduce the file size without losing resolution?
Your phone has done a good job Stuart. I imagine the sky was darker than it looks?
Last edited by Graeme on 04 Mar 2023, 05:10, edited 1 time in total.
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- PlutoniumLounger
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Re: Jupiter and Venus
I'm not sure I understand the question, but that has never stopped me from providing an answer ...
(1) Mathematically I think that there must be some loss of resolution when the file size is reduced and the file retains its original format (e.g. JPG)
(2) Practically I use VSOImageResizer Cheers, Chris
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He who plants a seed, plants life.
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- Panoramic Lounger
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Re: Jupiter and Venus
I use the last version of IrfanView (v4.57, 32 bit) that supports the RIOT plugin, i.e. the last version in which 'File | Save for Web' actually does something rather than just giving an unhelpful message. To learn more about RIOT see these recent posts starting here:
https://www.eileenslounge.com/viewtopic ... 68#p304168
Affinity Photo's export as JPEG feature is also good.
Ken
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Re: Jupiter and Venus
On my android phone, I use an app which downsizes photos. The one I use is called "photo and picture resizer", which is free but with ads. There are other resizing apps, some are rated higher. I almost only ever use it for the Lounge.
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- Cosmic Lounger
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Re: Jupiter and Venus
Thanks for the tips. There are quite a few image re-sizing programmes but they change the image size. The nice thing about IrfanView is that you can set the file size to 250kb. I'm using version 4.60 and the Riot plugin isn't listed. I'll look into it.
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Re: Jupiter and Venus
The only way to get IrfanView to use the RIOT plugin is to revert to v4.57.
If you want to use the latest version of IrfanView then you have to install RIOT as a standalone and use that standalone version.
Alternatively, as I mentioned, the export to JPEG feature of Affinity Photo can get files down to <256 KB, though you have to set the necessary 'quality' by trial and error, there's no set file size option.
Ken
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Re: Jupiter and Venus
I'm still [in the] game! Taken just before bedtime this Friday night.
Cheers, Chris
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He who plants a seed, plants life.
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- Cosmic Lounger
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Re: Jupiter and Venus
Nice one Chris. It's been cloudy here last few nights. I see Venus is above Jupiter now!
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- PlutoniumLounger
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Re: Jupiter and Venus
Hi Graeme, I hoped that you'd like it. I held the phone side against the window frame to steady it as best I could. (I bet that YOU wish you had a $65,000 camera tripod, eh?)
I was about to correct you and say "Not atop, but [trailing] behind Jupiter", then I realized that "behind" would upset purists who would reason that, in terms of our (family of planets) orbital positions, Venus must always be seen to be in front of Jupiter, and that had yielded the paradox of a planet being both behind and in front of another planet simultaneously!
Sorry to hear about the clouds. Why not drop the temperature to -15c; that gets rid of cloud like an Easi-Wipe(TM) and you can still enjoy a balmy -6c during daylight hours .....
Cheers, Chris
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Re: Jupiter and Venus
ChrisGreaves wrote: ↑04 Mar 2023, 06:12I was about to correct you and say "Not atop, but [trailing] behind Jupiter"
They have passed each other from our viewpoint and Venus now has the higher altitude?
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- PlutoniumLounger
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Re: Jupiter and Venus
We are still on shaky ground here.
They haven't actually passed each other, have they, excepting in the very limited sense of an earthling's view of their positions relative to us?
Even our requires us to specify Earthlings.
Higher altitude seems tricky, too, since those of us who are in the Other Hemisphere must see that Venus has the lower altitude, as every skoolboy kno?
You were OK as long as you were praising my photo. I would stick to that in future, if I were you
Cheers, Chris
He who plants a seed, plants life.
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- PlutoniumLounger
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Re: Jupiter and Venus
I have now finished my first coffee and am partway through my second; so let's try responding again, shall we?
I'm glad that you started this post. I was pleased at my efforts last night and a week ago.
For all my complaints about light pollution here, I got away with more than a couple of photos, I got A Great View of this event. Better, I think, than my efforts from a west-facing balcony ten+ years ago.
Simultaneously I thought of all the folks here watching another rerun of Cagney and Lacey while I gazed at these two bright objects bidding a farewell to my latest day and exiting Stage West.
I have in mind this summer to build a serious sun-dial, along the lines that Portugese navigators might have used. I have read stories of many folks who were unable to gaze at stars at night but made detailed readings of the sun - flares, spots etc.
Cheers, Chris
He who plants a seed, plants life.
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- Cosmic Lounger
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Re: Jupiter and Venus
ChrisGreaves wrote: ↑04 Mar 2023, 10:31We are still on shaky ground here.
They haven't actually passed each other, have they, excepting in the very limited sense of an earthling's view of their positions relative to us?
Even our requires us to specify Earthlings.
Higher altitude seems tricky, too, since those of us who are in the Other Hemisphere must see that Venus has the lower altitude, as every skoolboy kno?
You were OK as long as you were praising my photo. I would stick to that in future, if I were you
Cheers, Chris
But they have passed each other. Hence the use of "from our viewpoint". Altitude is ok too. The location of a celestial object is located using Azimuth and Altitude. Alternatively we could use right Ascension and Declination if you prefer.
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- PlutoniumLounger
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Re: Jupiter and Venus
Ascension would work; I know that's in the southern hemisphere, but where is declination?
Cheers, Chris
He who plants a seed, plants life.
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- PlutoniumLounger
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Re: Jupiter and Venus
Well, another month has come and gone, and with it a clear evening sky:- This is a crescent moon with Venus in its arms. The neighbours are all inside with their 72" flat-screen TVs.
Then this morning's news:-
A stunning lineup of five planets will decorate the night sky
The mnemonic drilled into me in 1959 was "Mister Venus Entered My Jolly Submarine Under The North Pole", so when the article says "include Mercury, Venus, Mars, Jupiter and Uranus" I mentally expand it to include Earth, represented by the moon!
Tuesday evening
Cheers, Chris
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He who plants a seed, plants life.