HKBWS BBS 香 港 觀 鳥 會 新 聞 組    Discussion Area 討論區    Photo Gallery 相片分享 I (Moderators: carmen, BBS Moderators, George_Ho, Kwok Jai, Forrest FONG)    Northern Shoveler « Previous topic | Next topic » Pages: 1  Reply Send Topic Print    Author  Topic: Northern Shoveler  (Read 652 times) Anguslau BBS Member BBS God I love bird watching!     Posts: 402 Northern Shoveler « on: Nov 5th, 2005, 11:16am » Quote Modify Its duck time again at NSW! Weather is perfect too. Very nice place to be this time of the year. But the place is getting very popular and sometimes noisy even on weekdays.   NSW 3/11/2005 1D Mark II, EF600, f/4, 1/5000s, iso320 http://www.pbase.com/anguslau/image/51782720.jpg   « Last Edit: Nov 29th, 2005, 11:10am by BBS Moderators » Logged anonymous_guy2 BBS Member BBS God I love bird watching!     Gender: Posts: 209 Re: Northern Shoveler « Reply #1 on: Nov 5th, 2005, 1:27pm » Quote Modify Wonderfully clear shot - can you send some (the birds) over to Lamma......., please Logged Your inability to tolerate my ambiguity is compounding your neurosis KK Hui BBS Member BBS God Bird Photography - at its best ...     Posts: 940 Re: Northern Shoveler « Reply #2 on: Nov 5th, 2005, 1:29pm » Quote Modify Good job getting the eye thro the wing, Angus! BTW the sharpening halo seems excessive this time ...     Would go early and avoid weekends for the crowd. Nothing much we can do other than that unfortunately.   KK Hui FRPS www.geocities.com/kkhui_001 Logged Anguslau BBS Member BBS God I love bird watching!     Posts: 402 Re: Northern Shoveler « Reply #3 on: Nov 5th, 2005, 4:45pm » Quote Modify Thanks for the comments!   kk, I am being haunted by these sharpening halos. Hope you can give me a hand here. I can see the halo very clearly, particularly below the dark belly of the bird. I tried reprocessing the image again. But can even see the halo without sharpening. I think I am doing something wrong here. Would you mind take a look at my work flow and see what I have done wrong? BTW, also tried converting using the PS ARC for comparison, same halo problem.   Here is a link to a tighter crop of the image which I have done the following: 1. Converted from raw to 16-bit TIFF using Capture One Pro: Increased EV by 0.15, disabled sharpening, enabled chroma noise reduction, luminance noise reduction off 2. Loaded TIFF into PS, cropped image 3. noise reduction using NeatImage, no sharpening 4. increased contrast using curve 5. increased saturation very slightly using channel mixer 6. saved as JPG at maximum quality and uploaded to pbase. Image link: http://www.pbase.com/anguslau/image/51793671/original.jpg   What I usually do for a normally sharp image (like this one) after all other processing is apply sharpening using USM in PS: amount=300, radius=0.3, threshold=0. This will give me a sharp image when viewed on screen at 100% without excessive artifacts. I may try other sharpening methods if this doesn't work well. I then save the image as JPG at maximum quality to become my "master" processed image (I do not save TIFF files to save disk space).   For web posting, I do the following: 1. load the "master" JPG file into PS 2. add border, image fit to 650x650: bicubic sharper 3. apply USM: amount=100, radius=0.2, threshold=0 4. apply USM again: amount=100, radius=0.2, threshold=0 5. convert to 8 bit, convert color profile to sRGB 6. save as JPG, quality=8 7. upload JPG to pbase   I believe the sharpening halo still looks reasonable on my "master" JPG (after sharpening). But during the conversion for web posting, the halo becomes excessive. Would that be your take as well? Any suggestions you can give to me to cure or alleviate this problem? Thanks! « Last Edit: Nov 5th, 2005, 4:50pm by Anguslau » Logged KK Hui BBS Member BBS God Bird Photography - at its best ...     Posts: 940 Re: Northern Shoveler « Reply #4 on: Nov 5th, 2005, 5:17pm » Quote Modify Angus,     The workflow looks good as is. Now I took your 'original.jpg' and process it in PS CS2 and result is as shown; no halo!     I first resize it to at 72 ppi. Then selective sharpened the subject using usm with 300/0.2/0. Deselect and finish off by overall sharpening using usm with 200/0.2/0 this time. That's it! However I havn't applied any noise reduction filter, saturation or contrast in this one.   Amount of sharpening would very much depend on the quality and size of the image to start with ...     See what you think!   KK Hui FRPS www.geocities.com/kkhui_001 Logged Bob Thompson BBS Member BBS God I love bird watching!     Gender: Posts: 433 Re: Northern Shoveler « Reply #5 on: Nov 5th, 2005, 5:43pm » Quote Modify KK,   Maybe the society could organise another hands on lecture in processing of digital pictures.   One part of photography is capturing the shots (which a lot of members are doing very well) but it is in the processing side, where we all need help.   As can be seen above, you were able to make Angus's good shot into an even better shot.   Hope to see you all at NSW next week   Bob Logged Anguslau BBS Member BBS God I love bird watching!     Posts: 402 Re: Northern Shoveler « Reply #6 on: Nov 5th, 2005, 9:45pm » Quote Modify kk, thanks very much for the demonstration. I think I finally figured out the cause of the problem! Hope this will be useful for others too.   After trying out all sorts of combinations, I found that there are two problem steps in my workflow: 1. sharpen the "master" JPG before resizing 2. resizing using bicubic sharpen   I found that if either of the above were present, there will be sharpening halos. To minimise sharpening halos, I need to apply the following workflow: 1. do all other processing such as cropping, color, contrast etc 2. resize for web using bicubic smooth 3. select the subject (feather or not doesn't make much difference) 4. usm 500 0.2 0 5. usm 100 0.2 0 6. usm 100 0.2 0 (may be more or less depending on image) 7. deselect subject 8. usm 200 0.2 0 9. convert to sRGB and save for web   Here is my final output, halo is very subdue!   kk, the version you got was still in Adobe RGB, hence color looked a bit off. To bring justice, below is the one converted to sRGB to bring back the color:   « Last Edit: Nov 5th, 2005, 9:46pm by Anguslau » Logged KK Hui BBS Member BBS God Bird Photography - at its best ...     Posts: 940 Re: Northern Shoveler « Reply #7 on: Nov 6th, 2005, 8:20am » Quote Modify Angus,   Oops! I didn't even check for color profile in my last repost. Thanks anyway!   I'd say you solved your problem ... Always do the post editing after crop and resize. Leave the sharpening as your last step then add frame/border and signature if you like. In resizing I find it's best to use the normal 'Bicubic'.   Best and Good Shooting!   KK Hui FRPS www.geocities.com/kkhui_001 Logged Pages: 1  Reply Send Topic Print Forum Jump: ----------------------------- Announcement 簡訊通告 -----------------------------  - Membership Affair 會員事務   - Outings / Activities 戶外活動 / 講座   - Projects 項目計劃   - Crested Bulbul Club 紅耳鵯俱樂部 ----------------------------- Discussion Area 討論區 -----------------------------  - General 一般問題   - Conservation 自然保育   - Bird Identification 鳥類辨識   - Birding Reports & Tips 觀鳥報告及心得 => Photo Gallery 相片分享 I   - Photo Gallery 相片分享 II ----------------------------- Special Topics 特別主題 -----------------------------  - Wild Birds & Avian Flu 野鳥與禽流感   - Sustainable Management Scheme in Long Valley 塱原可持續生態管理計劃   - Black-faced Spoonbill 黑臉琵鷺   - Goodbye Penfold 告別彭福   - Tern Conservation 燕鷗保育   - Black-eared Kite 鳶(麻鷹)   - Swifts and Swallows 燕與雨燕   - China Birdwatching Network 中國觀鳥活動網絡   - Winter Altas Survey 冬季鳥類普查   - Nature Conservation Policy 自然保育政策 ----------------------------- Knowledge Sharing 知識分享 -----------------------------  - FAQ 常見問題   - Archive 資料重溫 « Previous topic | Next topic »

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