Skip to content

2003.11.25 15:25

달사진 모자익 방법

(*.101.108.100) 조회 수 3922 댓글 0
?

단축키

Prev이전 문서

Next다음 문서

크게 작게 위로 아래로 댓글로 가기 인쇄
?

단축키

Prev이전 문서

Next다음 문서

크게 작게 위로 아래로 댓글로 가기 인쇄
http://celestialwonders.com/articles/lunarmosaic


At 12:45 24/11/2003 -0500, you wrote:
>Hi Juan,
>
>I am enjoying your mosaic very much.  The detail along the terminator
>is striking!  At your focal length you are resolving some features I
>don't get with my C8. The First Quarter has some very interesting
>features.  I guess I have an affinity for high resolution mosaics like
>this, and I suppose it's kind of becoming my specialty :-)
>
>If you're interested, I've just finished an article on the technique I
>use to construct lunar mosaics.  I have hopes of getting this
>published<g>. Your mosaic demonstrates a couple of the hardest parts:
>hiding the seams and normalizing the histograms.  My article discusses
>both of these in some detail.  Since you are using Photoshop to put the
>mosaic together, the article may be of some benefit. I use a CCD camera
>and calibrate/normalize the FITs files before saving as TIFF format,
>but I'd like to try this with a webcam (and film <g>) as I know many
>lunar imagers use these mediums. Anyhoo, the article can be found at:
>http://celestialwonders.com/articles/lunarmosaic
>
>I've never tried a color mosaic and I think you have done a marvelous
>job (and 50 sub images is alot of work)!  The only thing I might
>recommend is a curves adjustment to enhance the constrast in the
>midtones. Please don't hesitate to post your next attempt!  BTW, I
>would kill for 8/10 seeing!
>
>Thanks,  Frank
>http://celestialwonders.com




Hi Frank,

Thank you very much.

Your article is excellent. The information given is great and very helpful.
Thanks for sharing.

When I get some more time, I probably will reconstruct the whole mosaic
from scratch. Then I'll test some of your procedures, especially the eraser
trick to avoid the seams.

After your advice about contrast and some other suggestions received, I
have managed to reprocess the mosaic image. Here is the result (1.9 MB, but
it's worth the bandwith waste):

http://astrosurf.com/pleiades-ap/20030409/mosaic-L-curves-atw.3000.jpg

This is the result of:
1. Adjusting a bit some transitions between subimages to reduce brightness
differences
2. A careful (and difficult) curves adjustment for better overall contrast 3. Boosting wavelet processing / noise reduction to the limit

I have done 1 in Photoshop, and 2,3 in our PixInsight. The amount of detail
is so high this time, that usual bicubic interpolation resampling does not
convince me to preserve sharpness. I have used a high performance bicubic
spline interpolation algorithm to reduce the image, and quality 12 jpeg
compression to prevent detail losses and artifacts.

I have decided to desist of making a color lunar mosaic for now. I'm not
happy with achieved color consistency --- not an easy work that needs much
more accurate proceedings.

Please look with a blind eye to the multiple seams and mosaicing
artifacts... hope to do better next time.

Best regards,
Juan Conejero.

천문 사이트 Links

외부 사이트들의 좋은 정보 등을 같이 읽어봅니다.

List of Articles
번호 제목 글쓴이 날짜 조회 수
230 환상적인 남반구에서의 Mcnaught ~~ 9 file 신병석 2007.01.22 4306
229 화성의 자전 5 이건호 2003.10.28 4359
228 화성의 시뮬레이션-디테일 1 이건호 2003.08.01 3899
227 화성의 두 위성 사진 이건호 2003.07.22 5180
226 화성과 쌍가락지 2 이건호 2003.09.08 3814
225 화성 사진 6-21 이건호 2003.06.23 4156
224 화성 2003년 7월 3일 이건호 2003.07.04 3984
223 화성 2003년 6월 28일 이건호 2003.07.04 3715
222 호주 원격관측소 1 file 이건호 2010.09.08 3333
221 호주 아마추어 제작 16인치 뉴턴 2 이준희 2010.09.29 3514
220 허걱!! -수정 1 박경원 2003.09.19 3541
219 해외 원정 카페 file 황인준 2012.05.31 2400
218 합성일까요? 2 이준희 2008.07.28 4954
217 필리핀 세부 섬의 시상 6 이준희 2006.03.22 5852
216 플레아데스, 장미, 말머리 - 10D 6 이건호 2003.12.06 3794
215 포토샵 레이어링 이건호 2003.05.12 4305
214 텔레뷰 파워메이트 file 이건호 2004.03.08 4876
213 텔레뷰 델로스 25%할인 김종호 2014.11.14 1054
212 태양관측장비업체 3 김종호 2014.05.29 1353
211 태양 오토가이더 소프트웨어 5 file 김종호 2014.09.24 1261
Board Pagination Prev 1 2 3 4 5 6 7 8 9 10 ... 12 Next
/ 12

NADA. Network of Amatuer Digital Astrography © Since 2003, All Rights Reserved

Design ver 2.0 / Google Chrome 에 최적화 되어 있습니다.

sketchbook5, 스케치북5

sketchbook5, 스케치북5

나눔글꼴 설치 안내


이 PC에는 나눔글꼴이 설치되어 있지 않습니다.

이 사이트를 나눔글꼴로 보기 위해서는
나눔글꼴을 설치해야 합니다.

설치 취소