Sulle elaborazioni delle immagini planetarie tanti metodi ma quale verita' ?
Inviato: 19/11/2011, 20:48
Difficile ammetterlo ma piu' facile scoprirlo quando una immagine "pseudo dettagliata " "elaborata " da alcuni imagers planetari , contiene "tecniche" elaborative che esaltano una una "pseudo potenzialita' strumentale " .
Il gioco a " io lo faccio piu' bello " pero' non e' apprezzato in ambito professionale il quale pur riconoscendo all'ambito amatoriale notevole lavoro anche di buon livello , richiede invece un modus operandi un po' diverso .
Riporto uno stralcio con le richieste da parte J.H Rogers che collabora con Alpo Japan :
About Jupiter images John H. Rogers 2011/10/23 20:04(UT)
Hi all,
First, many thanks to everyone who has been sending images of Jupiter, whether directly to me or through various forums. I regret not being able to acknowledge them individually but they are all valued. It is amazing to see how many observers are producing excellent images now the planet has moved into the northern sky, and you are creating an excellent record of the planet. There is widespread professional recognition of the high quality of your work. Earlier this month I attended the big European/American planetary science conference (EPSC/DPS) in Nantes, France, and was able to present our amateur analysis of your images to an appreciative professional audience.
May I make a few comments about some aspects of the images, as processing techniques are becoming ever more advanced, and more new observers are joining in. To summarise:
1) If you produce LRGB images, it is essential to state what 'L' is. For natural appearance, use L = White.
2) If you produce rotation movies, please also provide some original images, and possibly the map if you have made one. 3) Please write the essential data on the image, and use a filename that includes the date (year-month-day) and your name or initials.
We are amateurs so we can do what we like, but we must not allow creative manipulations to be mistaken for real data, so if you do any unusual image-processing for artistic purposes, please state what it was on the image.
1) LRGB images:
-------------------
These are images in which the luminosity (dark-to-bright) scale is produced separately from the colour (R,G,B) channels. Many European observers last year produced LRGB images with L = Red or IR, because these wavebands tend to have higher resolution. With the low altitude of the planet, this was the only way that many observers could produce an image with reasonable resolution and some colour information. It was good to have these images, but hopefully they are not needed now. By mixing colour from one waveband with intensities from another, they produce unrealistic colour and unrealistic intensities: thus belts that should be dark brown come out luminous pink, and there is no info about the true appearance of red ovals like the GRS. If you do produce LRGB images, you must always state (on each image) what L is, and I strongly prefer L = White. If a red or IR image has much better resolution than the RGB image, then please provide both.
Some observers routinely provide all the separate colour channels as well as the RGB image. I don't generally need these for descriptive reports, which are mostly derived from RGB images. (I sometimes use an IR image as well, for higher resolution and to highlight specific features.) However if the JUPOS team are measuring your images, they may well prefer the highest-quality monochrome image as the limb will be better-defined.
2) Rotation animations and maps:
--------------------------------
Several observers are now producing beautiful rotation movies of the planet. Although these are impressive to look at, we cannot measure them, so please also provide some of the original images. Also, if you make a movie by reprojecting images via a hi-res map covering more than half the planet, perhaps you could post the map itself, which might be a useful reference.
Please do not rotate images before combining them into a RGB image that will be used for measurement; this can cause errors due to difficulty defining the limb.
Filenames and labelling:
--------------------------
Most observers submit images to several different organisations, which have slightly different preferences for format, so it's understandable if you don't use our exact format. However, two points are specially important:
i) Write all the information on the image itself (date, time, observer, location, telescope, filters if any, and preferably CM longitudes).
ii) Use a filename which includes the date in the standard astronomical order (year-month-day), and your name or initials. This makes it much quicker to download and file your images. Our preferred format is given on our web site (URL below), but I'm happy to receive images in similar formats, such as the one used by PVOL: J_yyyy-mm-dd_hh-mm_filter_observer.jpg.
(It is very confusing when people use 6-digit abbreviations for date where year, month and day can be in any order. I am looking forward to 2011 Nov.11, which will be the one day this year when these filenames are unambiguous.)
It is also easier to handle all the files if you group all images from one night into a single image file.
Best wishes to all,
John
Come recita il titolo di una canzone " Tutto il resto e' noia " e quindi passare ore e ore a massacrare con "pseudo luminanze " una povera immagine per farne sputare chissa' quali dettagli e' non solo inutile ma anche se vogliamo dire , poco professionale .
Ciao Andy
Il gioco a " io lo faccio piu' bello " pero' non e' apprezzato in ambito professionale il quale pur riconoscendo all'ambito amatoriale notevole lavoro anche di buon livello , richiede invece un modus operandi un po' diverso .
Riporto uno stralcio con le richieste da parte J.H Rogers che collabora con Alpo Japan :
About Jupiter images John H. Rogers 2011/10/23 20:04(UT)
Hi all,
First, many thanks to everyone who has been sending images of Jupiter, whether directly to me or through various forums. I regret not being able to acknowledge them individually but they are all valued. It is amazing to see how many observers are producing excellent images now the planet has moved into the northern sky, and you are creating an excellent record of the planet. There is widespread professional recognition of the high quality of your work. Earlier this month I attended the big European/American planetary science conference (EPSC/DPS) in Nantes, France, and was able to present our amateur analysis of your images to an appreciative professional audience.
May I make a few comments about some aspects of the images, as processing techniques are becoming ever more advanced, and more new observers are joining in. To summarise:
1) If you produce LRGB images, it is essential to state what 'L' is. For natural appearance, use L = White.
2) If you produce rotation movies, please also provide some original images, and possibly the map if you have made one. 3) Please write the essential data on the image, and use a filename that includes the date (year-month-day) and your name or initials.
We are amateurs so we can do what we like, but we must not allow creative manipulations to be mistaken for real data, so if you do any unusual image-processing for artistic purposes, please state what it was on the image.
1) LRGB images:
-------------------
These are images in which the luminosity (dark-to-bright) scale is produced separately from the colour (R,G,B) channels. Many European observers last year produced LRGB images with L = Red or IR, because these wavebands tend to have higher resolution. With the low altitude of the planet, this was the only way that many observers could produce an image with reasonable resolution and some colour information. It was good to have these images, but hopefully they are not needed now. By mixing colour from one waveband with intensities from another, they produce unrealistic colour and unrealistic intensities: thus belts that should be dark brown come out luminous pink, and there is no info about the true appearance of red ovals like the GRS. If you do produce LRGB images, you must always state (on each image) what L is, and I strongly prefer L = White. If a red or IR image has much better resolution than the RGB image, then please provide both.
Some observers routinely provide all the separate colour channels as well as the RGB image. I don't generally need these for descriptive reports, which are mostly derived from RGB images. (I sometimes use an IR image as well, for higher resolution and to highlight specific features.) However if the JUPOS team are measuring your images, they may well prefer the highest-quality monochrome image as the limb will be better-defined.
2) Rotation animations and maps:
--------------------------------
Several observers are now producing beautiful rotation movies of the planet. Although these are impressive to look at, we cannot measure them, so please also provide some of the original images. Also, if you make a movie by reprojecting images via a hi-res map covering more than half the planet, perhaps you could post the map itself, which might be a useful reference.
Please do not rotate images before combining them into a RGB image that will be used for measurement; this can cause errors due to difficulty defining the limb.
Filenames and labelling:
--------------------------
Most observers submit images to several different organisations, which have slightly different preferences for format, so it's understandable if you don't use our exact format. However, two points are specially important:
i) Write all the information on the image itself (date, time, observer, location, telescope, filters if any, and preferably CM longitudes).
ii) Use a filename which includes the date in the standard astronomical order (year-month-day), and your name or initials. This makes it much quicker to download and file your images. Our preferred format is given on our web site (URL below), but I'm happy to receive images in similar formats, such as the one used by PVOL: J_yyyy-mm-dd_hh-mm_filter_observer.jpg.
(It is very confusing when people use 6-digit abbreviations for date where year, month and day can be in any order. I am looking forward to 2011 Nov.11, which will be the one day this year when these filenames are unambiguous.)
It is also easier to handle all the files if you group all images from one night into a single image file.
Best wishes to all,
John
Come recita il titolo di una canzone " Tutto il resto e' noia " e quindi passare ore e ore a massacrare con "pseudo luminanze " una povera immagine per farne sputare chissa' quali dettagli e' non solo inutile ma anche se vogliamo dire , poco professionale .
Ciao Andy