Macro versus compression

Feb 09, 2020,09:49 AM


As some of you might be aware of, I’m on a self-tutoring experiment with photography.

One of the subjects I’m trying to master is macro photography. I thought that would be the proverbial “cup of tea”.

I’ve got a pretty good camera Nikon D7500, pretty nice Nikon 40 mm prime macro lens, sturdy stable tripod so what could possibly go wrong?

Aim shoot done.

Well today I discovered that one camera feature I thought was brilliant, turned out to be less brilliant as I hoped.

Here it is in summary: the camera uploads every picture automatically to my photos on the iPhone or iMac either by WiFi or Bluetooth.
So the photo went from camera to iPhone, there it’s uploaded automatically in iCloud, download on big iMac and toy around with post production.

What I discovered today (some f not all might laugh about it) is that if I take the memory card out of the camera and plug it directly into the iMac the same photos or transferred yet there not quite the same.
Because with the Bluetooth WiFi Route, the image is compressed

Full size picture is approx 8 mb compressed 700Kb

On a phone hard to tell the difference. When trying to improve on a 27 inch high resolution iMac screen, the differences are shocking.

I’ve put both photos below but since the upload to the forum will probably compress them, I’m afraid you can’t really see big difference. But zoom in and you’ll see little scratches visible on one not on the other.

It’s a nightmare keeping them apart on my photo library so I’ve split that in: camera upload and card upload and in due time I’ll figure out what to do next.

Go ahead have your laugh (I could t resist laughing about it myself as well) but it’s one of those “discoveries” on the road to improvement.

  login to reply

Comments: view entire thread


I saw the same model today at the VC boutique

 By: Mohannad (aka Riddler) : February 9th, 2020-13:11
Great triple/full calendar harmony

Tweaking a 700Kb file vs an 8 mb file has got to produce different results...

 By: cshimokita : February 9th, 2020-15:20
Interesting real world example... the internet viewer (or smart phone user) will not be able to tell the difference... the marvels and convenience of technology ; ). What's the process when you shoot in RAW? I imagine the file is converted to in-camera jp... 

Real world

 By: Jurry : February 10th, 2020-01:25
You’ve hit the nail on the head, if all files uploaded or downloaded to forums etc are compressed anyway and on devices the difference is hardly noticeable, then why even care work8ng with big files in the first place. But if you put the two next to each ... 

Turn off the transfer, pull the card and stick it into your Mac, then drag in the photos.

 By: cazalea : February 9th, 2020-16:31
Problem solved. I have to force myself to do this because the other way, as you have noticed screws up everything. I do have my desktop going to the Apple Cloud, but not my entire library which is still in (obsolete) Aperture. And I am backed up on extern... 

Thanks for your suggestion.

 By: Jurry : February 10th, 2020-01:18
The transfer was one of the features why we selected this camera. Point being is that we typically collect all photos fr m iPhones etc in one shared iCloud folder for the family spread around the globe to see. Such folders are like near real time blogs. W... 

I think the dual track is the best approach

 By: cazalea : February 10th, 2020-05:02
Frankly, the new generation of software and devices working with social media spreads across the web billions of images all tagged by time, subject, Face ID and location. Who could ask for more? Or less? Well, someone who doesn’t want his watch photos tag... 


 By: Weems@8 : February 10th, 2020-13:53
Digital photography. Start to understand systems. A mirror reflex camera, and all it’s benefits. What is important? 1. Light. Make pictures with good light. Example: Professional photographers use huge lamps. 2. Make pictures in RAW. This gives the maximu... 

Thanks for your input [nt]

 By: Jurry : February 11th, 2020-03:17