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ที่เว็บไซต์partnershipvt.orgคุณสามารถอัปเดตเอกสารอื่น ๆ นอกเหนือจากarcsin คือสำหรับข้อมูลที่มีค่ามากขึ้นสำหรับคุณ ที่เว็บไซต์Partnership VT เราอัปเดตข้อมูลใหม่และถูกต้องให้คุณทุกวัน, ด้วยความหวังที่จะให้บริการอย่างคุ้มค่าที่สุดสำหรับคุณ ช่วยให้คุณข้อมูลเสริมบนอินเทอร์เน็ตในcáchวิธีที่สมบูรณ์แบบที่สุด.

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มีหลายวิธีในการยืดภาพทางดาราศาสตร์เชิงเส้นดิบที่เรียงซ้อนกันใน Photoshop อย่างไรก็ตาม ในความคิดของฉัน มีเพียงวิธีเดียวที่ดีที่สุด นั่นคือการใช้เทคนิคไฮเปอร์โบลิกอาร์คไซน์ซึ่งกล่าวถึงในวิดีโอนี้ ฉันใช้กล้องถ่ายภาพดาราศาสตร์ ZWO ASI 294MC Pro และฟิลเตอร์อัลตร้าแบนด์สามวงแคบ และเทคนิคนี้เป็นวิธีที่ฉันใช้ในการยืดภาพ asto ใน photoshop ลิงก์ไปยังเว็บไซต์ของ Mark Shelly: .

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Astrophotography: The ABSOLUTE BEST way to STRETCH your Astro Image data in Photoshop [PS]!
Astrophotography: The ABSOLUTE BEST way to STRETCH your Astro Image data in Photoshop [PS]!

นอกจากการอ่านเนื้อหาของบทความนี้แล้ว Astrophotography: The ABSOLUTE BEST way to STRETCH your Astro Image data in Photoshop [PS]! คุณสามารถค้นหาบทความเพิ่มเติมด้านล่าง

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ข้อเสนอแนะบางประการเกี่ยวกับarcsin คือ

#Astrophotography #ABSOLUTE #STRETCH #Astro #Image #data #Photoshop.

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Astrophotography: The ABSOLUTE BEST way to STRETCH your Astro Image data in Photoshop [PS]!.

arcsin คือ.

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43 thoughts on “Astrophotography: The ABSOLUTE BEST way to STRETCH your Astro Image data in Photoshop [PS]! | arcsin คือข้อมูลล่าสุดที่เกี่ยวข้อง

  1. Growing Answers says:

    I just used this technique to stretch a the horse head. I used other techniques from other tutorials before and this is by far the best way. Other tutorials I have followed have ruined images that probably could have been much better. Funny thing is that the other tutorials are from people who are pretty well invested in the hobby. Thanks!

  2. Robert Stewart says:

    Hi Ed. I am using this technique and, after a series of stretches, I can see color in my stars but the nebulosity still looks grayscale. It is a reflection nebula so I am expecting some blue hue. I am zoomed in beyond 67% so that's not the problem.

  3. jhtrkhgvtkuyejh says:

    Man!!! Thank you SO much for sharing this info and for your good tutorials. I'm re-making all my astro images again; using this method, results just incredible! Thank you again!

  4. James Peirce says:

    Nice video. Well explained and demonstrated.

    One comment, though. Can’t you complete this process in 32 bit mode? Some desirable data deep in shadows is being compromised by the early 16-bit conversion, while it looks like these steps should be available in Photoshop’s 32 bit mode. Normally the 16-bit conversion would be made after completely the initial stretching (i.e. what is done in this video).

  5. ED Hendrikx says:

    I following this technique alswell i am using an Atik 383L mono, now I did the RGB images using this but What should i do with my Luminance? i mean how to add that to it? or is the multiply or divide layer the actual luminance layer? as i shoot with LRGB filters.

  6. Eric Goodnight says:

    Great tutorial. It has helped with a lot of my targets and I have re-processed them. However, it seems to fail dramatically on my M42 orion images. Any clue to why?

  7. Branko Nadj says:

    Great great video. I've been doping a landscape wide astrophotography, got my tracker few weeks ago, and I wonder if this technique would work well on wide lens shots…. Will try for sure.

  8. Kirk Miyashiro says:

    Thank you for the video. I am new to Astrophotography and just purchased a monthly subscription to PS. How do I load the unzip the file to PS which is web based? The instructions for loading the file assumes the program is physically on your computer. Thank you for your consideration in this matter

  9. Geoff Watt says:

    Hi. Does anyone know if these work on a Mac? I've installed them in what I think is the right place but they don't show up in the Preset Manager to load. Any help much appreciated.

  10. Mike Meal says:

    You're videos have been amazing and like others have said they are the most well explained I've seen, thank you so much!
    So I'm a newbie and have a 1600mm, how can I incorporate you're tutorials into a mono workflow? Should I simply assign my Ha, OIII and SII to my choice of Channels and pick up your video from there?

  11. Cosmoscarl says:

    Nice! You get right to the point! Are you using calibration frames. I was looking at Tony Halas's technique using no calibration frames because Photoshop has an algorithm to fix all of the most common problems that usually require calibration frames. He says that Adobe has been around for so long and put so much money into Photoshop that it's much better than all those expensive programs like Pixinsight and Maxim DL.

  12. Frank Sz says:

    I tried this and I ended up with a stretched black/white image instead of color.
    I don't use these keyboard combos and I have no idea which layer you copied over to the top, at the end.

  13. Stephen Norski says:

    Great results! However keep in mind, according to Mark Shelly's site, Photoshop is not capable of doing a hyperbolic arcsin due to restrictions on the plotted points. His workaround was to create functional square roots of the desired curves. Two stretches must be performed back to back so they multiply to a true hyperbolic. Mix and matching the various 10x, 30x, 100x… in order to get the stretch factor you need. Im not sure stretching thrice will give you a true hyperbolic either. Nevertheless, you gave a great intro into Mark's technique. Thanks.

  14. Paul E Mongillo says:

    OK, I'm with you up through stamp and desaturate the Grey multiply layer. I then stamp and add the Grey divide layer. Change the blend modes to Divide and Multiply. However when I begin stretching (arc sin) the image remains in grey scale. Yours doesn't. I have started this over about 5 times and the same thing happens. Suggestions? I know its something small I'm missing. Thanks for great instructional videos.

  15. Matt Miller says:

    Very interesting! I’m eager to try this on some data, but my images from my canon 6D tend to have a red glow and the red histogram leads the other two, would I want to boost the red in my green and blue channels instead to align the histograms?

  16. Kowalski K. says:

    That was interesting. But my question is, how much sense does this way of stratching make, when I remove the stars with Starnet ++ before stretching? What I understand is that it is about preventing stars from blowing out. So is there an other reson to use this stratching procedure?

  17. reid chandler says:

    This is a great video, i now have added these to the list of things to use for astroprocessing in PS. One question, I shoot mono with filters.. So, would it be best to stretch before I combine or after in this instance lrgb, and what does this mean for narrowband imaging?.. As far as how to utilize these with false color? Tips or hints?

  18. Ollie's Astro says:

    Hey Ed follow up question on this does it matter in which way you channel mix, for example the way my histogram was aligned, I had to drop the Green in my Blue channel. I'm guessing this is still fine?

  19. Jon Hanson says:

    So glad I ran across this video. I've watched at least a dozen videos on stretching, from all the usual astrophotography channels, and they're all variations on what boils down to an experienced astrophotographer using instinct and gut feel to adjust curves and levels. This video feels like a completely different approach. The arc-sine hyperbolic stretch demonstrated here has made a huge improvement in my images–and it's repeatable. When I was stretching by the seat of my pants my images came out different every time. With this technique I get much more consistent results and I'm not accidentally screwing up the color balance or clipping blacks and highlights. Great technique. Game changer.

  20. Alex Port says:

    Found this really helpful thanks. I like knowing the theory behind the curve, instead of eyeballing its good to know I can start from a known good initial stretch. I have a recent image of M42 I'm going to reprocess and see how much it changes the outcome.

  21. Rick Cudmore says:

    Can this process be completed with an image from L+RGB data? Once stacked in DSS, I normally use curves and levels on each colour and then combine them and then add the Lum. I find this method works great on a DSLR image.

  22. John Parker says:

    I have one image that has the main data towards the middle of the levels adjustment panel. There is also (height wise very small) a lot of data to the left of the main spike. Do you clip only up to the small data or go up to the main spike?  
    It looks kinda like this " _____IIIIII_____"

  23. Ken K says:

    I downloaded the arcsinh files. I put them in the same curves folder mentioned, but when I select Curves in PS, they are not there to select. Am I doing something wrong?

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