Search found 18149 matches

by rjlittlefield
Wed Apr 14, 2021 8:29 am
Forum: Equipment Discussions
Topic: S21 ultra: 108mp in RAW
Replies: 12
Views: 590

Re: S21 ultra: 108mp in RAW

Here is another comparison that I find interesting. These are corresponding sections, the first from 12000x9000 as downloaded, the second from 6000x4500 upscaled to 12000x9000. The 6000x4500 was made by Photoshop's Image > Image Size..., with "Bicubic (smooth gradients)" resampling. Again, display u...
by rjlittlefield
Tue Apr 13, 2021 2:02 pm
Forum: Equipment Discussions
Topic: S21 ultra: 108mp in RAW
Replies: 12
Views: 590

Re: S21 ultra: 108mp in RAW

By the way, I looked again. If I go through https://flic.kr/s/aHsmVfrTBn to reach the album, then I cannot find any way to access camera-resolution versions of the images. For the scene corresponding to https://live.staticflickr.com/65535/51112917357_b3a566f9a8_o.jpg , Flickr offers me only up to "L...
by rjlittlefield
Tue Apr 13, 2021 1:10 pm
Forum: Equipment Discussions
Topic: S21 ultra: 108mp in RAW
Replies: 12
Views: 590

Re: S21 ultra: 108mp in RAW

Thanks, those work. I pulled down the images and did some pixel-peeping. The extra pixels definitely help. Here are corresponding sections of the 12000x9000 at 200%, versus 6000x4500 at 400%. The 6000x4500 was made by Photoshop's Image > Image Size..., with Bicubic Sharper resampling. Display using ...
by rjlittlefield
Tue Apr 13, 2021 10:46 am
Forum: Equipment Discussions
Topic: S21 ultra: 108mp in RAW
Replies: 12
Views: 590

Re: S21 ultra: 108mp in RAW

Adalbert wrote:
Tue Apr 13, 2021 6:18 am
Hello everybody,
Enclosed you will find some JPGs 12000x9000px:
https://flic.kr/s/aHsmVfrTBn
Best, ADi
I tried several of the images and found nothing approaching that size, even when selecting the option to see all sizes.

Where exactly should I be looking?

--Rik
by rjlittlefield
Tue Apr 13, 2021 10:41 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: High key contrast method (post-processing tip)
Replies: 7
Views: 172

Re: High key contrast method (post-processing tip)

For whatever it's worth... After Beatsy's first post I immediately tried Lab in Photoshop, using a Curves adjustment layer on the "Lightness" channel. What I found was that even with Lightness pushed to its upper limit, the resulting image went nowhere beyond a bright yellow, something like RGB=[255...
by rjlittlefield
Sun Apr 11, 2021 8:35 am
Forum: Equipment Discussions
Topic: How Stupid Can Someone be? How about you?
Replies: 18
Views: 368

Re: How Stupid Can Someone be? How about you?

recommends to get the PCR Covid test in a week after the 2nd shot and it should show positive. I suspect some scrambling in the communication. Everything I read says that Moderna is an mRNA vaccine. It stimulates antibody production so it will likely produce a positive antibody test, just like a pr...
by rjlittlefield
Fri Apr 09, 2021 11:23 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Photomicrography demonstration on Zoom, 13th April 2021
Replies: 2
Views: 179

Re: Photomicrography demonstration on Zoom, 13th April 2021

Sounds interesting!

I'm glad to see that this will be available later as a recording, for those of us who are in radically different time zones.

--Rik
by rjlittlefield
Thu Apr 08, 2021 8:59 am
Forum: Equipment Discussions
Topic: Zerene Stacker performance on ARM macs?
Replies: 3
Views: 72

Re: Zerene Stacker performance on ARM macs?

Rashkh, welcome to photomacrography.net. I'm the fellow who wrote Zerene Stacker, and I answer all the support requests that come in by email. Here is what I recently wrote to another fellow: >Any comments on the Apple M1 for this sort of work? Is it much faster? It's a great chip, but important to ...
by rjlittlefield
Wed Apr 07, 2021 7:50 pm
Forum: Equipment Discussions
Topic: A7r4 pixel shift. Rather a resolution eye-opener
Replies: 17
Views: 340

Re: A7r4 pixel shift. Rather a resolution eye-opener

Here is an article on the topic by Jim Kasson. https://blog.kasson.com/the-last-word/does-pixel-shift-increase-resolution/ Unfortunately the body of that article has one significant flaw, and the subsequent discussion in comments is beyond my patience to try untangling. As I read it, the analysis s...
by rjlittlefield
Wed Apr 07, 2021 4:46 pm
Forum: Beginners Macro
Topic: Abbreviations for equipment and technicues
Replies: 8
Views: 140

Re: Abbreviations for eqiuppment and technicues

Rik, now that you mention it. I have the impression that Google lost track of a lot of the information on this site a while ago, maybe when the forum software was updated? There's been several times that I've tried to search for things that I know exists on this forum, but failed to find them using...
by rjlittlefield
Wed Apr 07, 2021 11:30 am
Forum: Beginners Macro
Topic: Abbreviations for equipment and technicues
Replies: 8
Views: 140

Re: Abbreviations for eqiuppment and technicues

Is there any abbreviation table or rules for describing the shooting technique? How can I correctly describe my photo in the gallery? There is no table. The main "rule" is only to try communicating accurately, completely, and concisely. Of course those three things conflict with each other, so some...
by rjlittlefield
Wed Apr 07, 2021 10:14 am
Forum: Photography Through the Microscope
Topic: Conjugating Mougeotia viridis - filamentous algae
Replies: 5
Views: 138

Re: Conjugating Mougeotia viridis - filamentous algae

Very nicely found, photographed, and explained -- thanks!

--Rik
by rjlittlefield
Tue Apr 06, 2021 6:35 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Hairy areas Zerene stacking problem
Replies: 8
Views: 212

Re: Hairy areas Zerene stackig problem

Thank you for the new images. Yes, I agree it is the same effect -- alignment being messed up by changing pattern of illumination. Have you ever encountered such instability in lighting? Yes, it is a common problem. One of the examples in my "How To Use DMap" tutorial is a small moth, shot with Spee...
by rjlittlefield
Tue Apr 06, 2021 3:58 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Hairy areas Zerene stacking problem
Replies: 8
Views: 212

Re: Hairy areas Zerene stackig problem

Thank you for the sample images. In the Google Drive folder, I see files named 2A0A8279.tif through 2A0A8283.tif, which I will call 279 through 283. I wonder if these are the frames you intended to upload, because they do not show any of the eye in focus. However, they do have sharp detail in some o...
by rjlittlefield
Tue Apr 06, 2021 9:02 am
Forum: Equipment Discussions
Topic: Focus stacking by moving only the camera (not the lens)?
Replies: 12
Views: 374

Re: Focus stacking by moving only the camera (not the lens)?

have yet to think of a simple way to find the nodal point The "nodal point" that you're talking about is actually the center of the entrance pupil, the so-called "no-parallax point" for panorama stitching. This is also the viewpoint = center of projection for normal perspective. The best way I know...