[LRflex] Re: Difference Display - ImageSharpening/Chromatic Aberration
- From: Philippe Amard <phamard@xxxxxxxxxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Mon, 14 Nov 2005 10:28:24 +0100
Much better now - thanks - reminds me of of fiddling in the lab, long ago
have a look at the last one on this page (smile) - this scan is from an
ageing print
http://perso.numericable.fr/%7Ephamard/BW.html
got to work now
cheers
Phileica
Douglas Sharp wrote:
>Philippe and Jerry,
>so gentlemen, I've inverted the difference analysis images and converted
>them to monochrome, .
>both sharpening examples have had their contrast increased to +72 in PS
>for display.
>The chromatic aberration image is without sharpening or noise reduction.
>http://gallery.leica-users.org/New-Old-Pictures/PB130001b_U_mask
>Unsharp masking PS
>http://gallery.leica-users.org/New-Old-Pictures/PB130001b_DIFF_NI_edited_1
>Neat Image
>http://gallery.leica-users.org/New-Old-Pictures/PB130001b_DIFF_FMjpg_edited_1
>Focus Magic
>http://gallery.leica-users.org/New-Old-Pictures/PB130001b_chorm PTlens
>chromatic aberration correction
>
>I hope you can see them now. The images show exactly what is added to
>the original shot to "improve" it.
>BTW, it's a nice way to make sketches out of photos.
>cheers
>Douglas
>
>Philippe Amard wrote:
>
>
>
>>Pity you live so far across the ocean; I still have a Pentium 200
>>waiting to be switched on back to life in the corner of the room ...
>>Wish you good health anyhow.
>>Yours
>>Phileica
>>
>>PS I couldn't see the pict either if this can restore confidence in your
>>most respectable gear
>>
>>Jerry Lehrer wrote:
>>
>>
>>
>>
>>
>>>Douglas,
>>>
>>>No, I AM the ANTIQUE.
>>>
>>>While i would love to have a Pentium 5, Windows 2006, computer
>>>with a 21 inch flat screen; I can't do it on Social Security. My
>>>prescription bills alone would pay for the best computer in the world.
>>>
>>>Jerry
>>>
>>>Douglas Sharp wrote:
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>>Jerry,
>>>>are you an antique dealer? ;-)
>>>>Nice to hear that you bought some really reliable stuff, pity you can't
>>>>see the fine detail on the "black" shots though, brightening them up
>>>>would have faked the results.
>>>>cheers
>>>>Douglas
>>>>
>>>>Jerry Lehrer wrote:
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>Douglas,
>>>>>
>>>>>Great, I suppose. All looks IDENTICAL to me with my 10 year
>>>>>old computer, running Win 3.1 on a 486 with 16Mm of RAM. on
>>>>>a 12 inch screen. All black.
>>>>>
>>>>>jerry
>>>>>
>>>>>Douglas Sharp wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>Just as a matter of interest (to me at least) hopefully to some of you
>>>>>>ot there in LRFLEX land
>>>>>>Focus Magic sharpening, one of the best sharpeners around, sharpened
>>>>>>with setting 1 (minimum)
>>>>>>http://gallery.leica-users.org/New-Old-Pictures/PB130001b_DIFF_FMjpg
>>>>>>It's easy to see that FM sharpens the edges to get a sharpening effect.
>>>>>>
>>>>>>In comparison, Neat Image, combined noise reduction(all channels) and
>>>>>>sharpening in the luminance channel only.
>>>>>>http://gallery.leica-users.org/New-Old-Pictures/PB130001b_DIFF_NI
>>>>>>Sharpening is not limited to the edges with Neat Image, this explains
>>>>>>the extra "shine" on metallic surfaces.
>>>>>>My experience however, shows that both methods have their merits, it all
>>>>>>depends on the input data.
>>>>>>Douglas
>>>>>>
>>>>>>Douglas Sharp wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>>An additional image, the difference between original and processed.
>>>>>>>http://gallery.leica-users.org/New-Old-Pictures/PB130001b_difference
>>>>>>>This shows quite clearly where the processes worked, the blue lines are
>>>>>>>the chromatic abberation, the lighter parts, sharpening in the luminance
>>>>>>>channel.
>>>>>>>the lighter it is the greater the difference, black is where one image
>>>>>>>cancels out the other by destructive interference, an old trick from
>>>>>>>geophysical data processing
>>>>>>>for analysing and attenuating noise (invert and add).
>>>>>>>Douglas
>>>>>>>Douglas
>>>>>>>
>>>>>>>
>>>>>>>Douglas Sharp wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>By the way, if you download both in PS-Elements 3.0 (if you have it) you
>>>>>>>>can compare the two shots on one split screen.
>>>>>>>>Douglas
>>>>>>>>
>>>>>>>>Douglas Sharp wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>>Xavier,
>>>>>>>>>I must answer your question with a clear NO - however you can get
>>>>>>>>>damned
>>>>>>>>>close if you do a little post processing.
>>>>>>>>>I hope you don't mind, I've posted your image and my correction at:
>>>>>>>>>
>>>>>>>>>http://gallery.leica-users.org/New-Old-Pictures/PB130001b your
>>>>>>>>>original
>>>>>>>>>http://gallery.leica-users.org/New-Old-Pictures/PB130001b_edited_2
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>Nice old camera, some time ago you mentioned DxO as a processing
>>>>>>>>>option,
>>>>>>>>>the alternative is PTlens (freeware)
>>>>>>>>>I ran your image through PTlens to correct the chromatic aberration
>>>>>>>>>(the
>>>>>>>>>bright blue edges on the adjustment ring, particularly strong above the
>>>>>>>>>500 shutter speed) and subsequently ran the whole thing through Neat
>>>>>>>>>Image to reduce noise and sharpen in the luminance (y) channel (to
>>>>>>>>>avoid
>>>>>>>>>bright edging).
>>>>>>>>>The improvement of the image is very obvious, considerably reduced
>>>>>>>>>fringing and the meatl parts look more "metallic" after Neat Image, and
>>>>>>>>>the whole job only took about 3 minutes.
>>>>>>>>>If you would like to try it -
>>>>>>>>>1) download and install PTlens - in PS or PS Elements or whichever
>>>>>>>>>other
>>>>>>>>>Image Processing you use.
>>>>>>>>>2) Check chromatic aberration (click in the box, make sure fish-eye,
>>>>>>>>>vignetting and distortion are unchecked)
>>>>>>>>>BTW, If your camera lens combination is listed you can set the camera
>>>>>>>>>and focal length and use distortion correction too
>>>>>>>>>4) Zoom into a part of the image where fringing is obvious
>>>>>>>>>5) Set slider Blue-Yellow to between +0.0042 and + 0.0047 (I used
>>>>>>>>>+0.0044)
>>>>>>>>>Click OK and your image is already improved.
>>>>>>>>>For noise reduction and sharpening:
>>>>>>>>>Neat Image:
>>>>>>>>>You can download a free stand-alone version (not a plug-in) which works
>>>>>>>>>very well -in fact it works so well I decided to buy the Neat Image Pro
>>>>>>>>>version, which also runs as a plug-in.
>>>>>>>>>Now the problems start - there are so many sliders and options that you
>>>>>>>>>need to practice for a couple of weeks before you find out exactly what
>>>>>>>>>they do, and how they affect your image. The effects can be quite
>>>>>>>>>spectacular when you get the settings right!
>>>>>>>>>
>>>>>>>>>Bille Xavier F. wrote:
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>>Helle Gentlemen.
>>>>>>>>>>
>>>>>>>>>>I just bought a "old" digital camera, P&S olympus. In fact, I believe
>>>>>>>>>>it is
>>>>>>>>>>enough for my needs so far.
>>>>>>>>>>
>>>>>>>>>>Obviously it is not matching the Panasonic with a Leica 12x lens but
>>>>>>>>>>enough
>>>>>>>>>>to do most of the daily internet photos I need.
>>>>>>>>>>
>>>>>>>>>>Here is an example, using the right white balance on a cloudy day,
>>>>>>>>>>macro:
>>>>>>>>>>
>>>>>>>>>>http://xavierf.b.free.fr/Temp/PB130001b.jpg
>>>>>>>>>>
>>>>>>>>>>It is a "good enough" camera: subject is the Agfa Isolette II shutter
>>>>>>>>>>(do
>>>>>>>>>>you see the spots on the coating?)
>>>>>>>>>>
>>>>>>>>>>Sorry for being off topic here but I truly believe in the "Bridge"
>>>>>>>>>>type of
>>>>>>>>>>cameras rather than the Reflexes. So far, I've read in the local
>>>>>>>>>>magazines
>>>>>>>>>>ant i's been confirmed by the local photog that a lens can be a real
>>>>>>>>>>dog on
>>>>>>>>>>a digicam while on another it becomes good.
>>>>>>>>>>
>>>>>>>>>>All depends on the sensor and the post processing.
>>>>>>>>>>
>>>>>>>>>>So, I hope the DMR has enough software to use the Rom contact and
>>>>>>>>>>decide
>>>>>>>>>>which profile is best.
>>>>>>>>>>
>>>>>>>>>>Alas, the DMR is to heavy for my flat purse...
>>>>>>>>>>---------------------------------
>>>>>>>>>>Xavier F. BILLE
>>>>>>>>>>Maisons-Alfort - France.
>>>>>>>>>>
>>>>>>>>>>
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>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
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>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
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