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Saturday, 26 May 2018 Dereel Images for 26 May 2018
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Protecting my private data
Topic: technology, general, opinion Link here

Yesterday the GDPR came into effect? Or is that the DSGVO? Or maybe the RGPD? And like so many people, I have received hundreds of messages with subjects like “We promise to keep your data safe” from companies I've never heard of, as this page describes.

OK, probably the law is useful, though it seems that the provisions are so complicated that some sites have chosen to shut down rather than to attempt to comply. I have chosen to do nothing. Firstly, I feel that anything people put on the web is effectively public. That limits things like banking, of course, but my understanding is that there are separate laws for that sort of thing. Secondly, though, I just don't keep personal data beyond what I mention in this diary, so there are no secrets to divulge. Hopefully I'm correct in this view.


More panorama stitching fun
Topic: photography, opinion Link here

House photo day again today, and nice weather. And once again I had difficulty with stitching my panoramas. Specifically, the control point detectors have difficulty finding corresponding points. Here what they made of the verandah panorama:

 
This should be Verandah-pano-detail-1.png.  Is it missing?
Image title: Verandah pano detail 1
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Why? What has changed?

In fact, quite a bit. I have changed my HDR merge software from enfuse to Photomatix PRO, and I'm using TIFF for the intermediate files. Could it be one of them. Tried it the old way, and I didn't have that problem, so yes, it seems that something in the new method is causing or uncovering problems.

In the process, though, found good examples of why I wanted to do it the new way. Here a partial image done first with enfuse, then with Photomatix (run the cursor over an image to compare it with its neighbour):


This should be house-from-ssw-2-0-enfuse-detail.jpeg.  Is it missing?
Image title: house from ssw 2 0 enfuse detail          Dimensions:          1092 x 796, 362 kB
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Image title: house from ssw 2 0 Photomatix detail          Dimensions:          1092 x 796, 357 kB
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Modern digital photography
Topic: photography, technology, food and drink, opinion Link here

Chris Bahlo along for dinner this evening (curry pierogi), and showed me a photo that she had just taken outside the house in the last fadings of twilight:

What's that ring? Chris thought that it might be temperature sensitive. I thought that it was probably refraction in ice crystals and thus independent of the temperature. Out to take a look. Yes, the moon was higher, but the halo was clearly visible. Take a photo with a real camera. Summilux 15 mm f/1.7 ASPH.?


This should be Moon-halo-1.jpeg.  Is it missing?
Image title: Moon halo 1          Dimensions:          4608 x 3456, 1492 kB
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That's completely out of focus! Also, the ring is too large to get the outside. I need something wider, but it also needs a large aperture. The difference in focal length of the Zuiko Digital ED 35-100 mm f/2.0 is probably not sufficient, and the M.Zuiko Digital ED 8mm f/1.8 Fisheye PRO is too wide, so how about the Leica DG Vario-Elmarit 12-60 mm f/2.8-4?


This should be Moon-halo-2.jpeg.  Is it missing?
Image title: Moon halo 2          Dimensions:          4608 x 3456, 2489 kB
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Better, but still not good. I need a tripod.


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Image title: Moon halo 3          Dimensions:          5184 x 3888, 1393 kB
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Dammit, this bloody expensive Manfrotto 808 can't get it up! This is the highest I could raise it:


This should be Manfrotto-804RC2-tripod-head-2.jpeg.  Is it missing?
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Does my el-cheapo head do any better? No: in fact, it seems to go to exactly the same angle, though there's no obvious reason not to go higher:


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Never mind, my panorama head can do it all. Put my camera on it, set f/8 in the hope of getting better focus, exposed for 30 s, and ended up with this photo:


This should be Moon-halo-3.jpeg.  Is it missing?
Image title: Moon halo 3          Dimensions:          5184 x 3888, 1393 kB
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Nothing spectacular, but certainly better than the mobile phone photo. Only it had taken me 15 minutes, while Chris had just pointed and shot. And my 30 seconds had been long enough for things to move:

 
This should be Moon-halo-3-detail.jpeg.  Is it missing?
Image title: Moon halo 3 detail
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Moving files in the smart phone age
Topic: technology, opinion Link here

So Chris and I had each taken photos of the moon. Clearly I needed her photos to write today's articles. OK, download the photos. Or is that upload? Dammit, no. The word is “copy”.

We spent an hour trying. I had got Chris to install WiFi File Transfer on her machine, so that should have been simple. But of course she has a different phone from mine (a Samsung SM-930F, also known as herolte or one of the various nonflammable Samsung 7 range), so of course the directory layout was different. Never mind, we tried “My Photos”, and sure enough, there were photos, going back 2 years up to about a week ago. Chris looked on the phone and found others, but of course it was too polite to give dirty internals like path names.

She also had ssh installed on the phone, so after getting past the smoke screen (“User name is root, default password is admin”; in fact, of course, Chris had her own password, and the user was definitely not root), I was able to establish that the thing had 14 file systems mounted, some of which appeared to be re-using the same space (she definitely didn't have 200 GB of storage on the machine). And we found a second directory with photos, with some name like 6364-6330. But I couldn't access them, and when I tried to copy them to the other directory, the device ran out of space (or, as df put it, there were only 1.6 GB of space free on the file system):

cp: write error: No space left on device
cp: can't preserve times of '/sdcard/DCIM/20180422_144033(0).jpg': Operation not permitted
cp: can't preserve ownership of '/sdcard/DCIM/20180422_144033(0).jpg': Operation not permitted
cp: can't preserve permissions of '/sdcard/DCIM/20180422_144033(0).jpg': Operation not permitted
...
127|herolte:/sdcard/DCIM $ df
Filesystem                    1K-blocks     Used Available Use% Mounted on
rootfs                          1666536     9164   1657372   1% /
tmpfs                           1803748      776   1802972   1% /dev
tmpfs                           1803748        0   1803748   0% /mnt
tmpfs                           1803748        0   1803748   0% /mnt/secure
/data/knox/tmp_sdcard          26034456 25243860    785476  97% /mnt/knox
/dev/block/dm-0                 4299884  4165332    134552  97% /system
/dev/block/sda15                 197472     7724    189748   4% /cache
/dev/block/sda3                   16048     2528     13520  16% /efs
/dev/block/sda13                   5032       68      4964   2% /persdata/absolute
/dev/block/sdd1                    1936      556      1380  29% /cpefs
/dev/block/dm-1                26034456 25243860    785476  97% /data
/data/knox/secure_fs/enc_user  26034456 25243860    785476  97% /data/enc_user
/data/media                    26013976 25248980    764996  98% /storage/emulated
/mnt/media_rw/6364-6330        62334976 47086848  15248128  76% /storage/6364-6330

herolte:/sdcard/DCIM $ uname -a
Linux localhost 3.18.14-12365438 #1 SMP PREEMPT Fri Mar 23 15:36:36 KST 2018 armv8l GNU/Linux

But is /sdcard really on the root file system? That makes no sense at all. Is the mount maybe not registered? There's no full file system to be seen in that df output. One way or another, that's a real mess.

Chris tells me that she can see them all when the device is connected to her Microsoft laptop with USB. Why can't I see it with standard tools? Somehow people took a well-functioning operating system (Linux) and broke all the rules to make something which nobody understands any more.

In the end Chris used the “modern” approach: send me mail via gmail. Out over the 802.11 link to eureka, into the Global Internet to the other end of the world, where it was received and sent back to eureka. O Brave New World, that has such solutions in 't.


Sunday, 27 May 2018 Dereel Images for 27 May 2018
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Debugging Hugin
Topic: photography, technology, opinion Link here

Why am I having so much trouble with Hugin lately? As I considered yesterday, there are many possibilities. The first step was to go back to where I was some months ago, creating JPEG intermediate images and then merging the HDR images with enfuse. And how about that, that worked much better.

OK, which part of my current work flow is to blame? Photomatix PRO or the use of TIFF for the intermediate images? Tried creating JPEGs with Photomatix, and got results that seem to be intermediate between yesterday's problems and the old-style work flow.

A number of issues make this particularly difficult: it all takes quite a bit of time, and the preview image doesn't match the final image. I've known that for a long time where images overlap: it merges overlaps differently, which can produce significantly different results from the preview. Here an example from the verandah panorama. First preview, then what it made out of it:

 
This should be Verandah-pano-detail-1.png.  Is it missing?
Image title: Verandah pano detail 1
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This should be Verandah-pano-detail-2.jpeg.  Is it missing?
Image title: Verandah pano detail 2
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In the preview, the fence post in the mid-foreground is duplicated, while in the final stitch the protection round the Hibiscus is duplicated.

And then there's another issue: a lot of these bugs aren't repeatable. The first time I tried this panorama, it came out upside-down, and the control points were different.

About the only useful thing I found was that I could use the .pto files from the enfuse version to start off the Photomatix version, and that I could then re-align and get even better results. But there are so many questions to answer.


This page contains (roughly) yesterday's and today's entries. I have a horror of reverse chronological documents, so all my diary entries are chronological. This page normally contains the last two days, but if I fall behind it may contain more. You can find older entries in the archive. Note that I often update a diary entry a day or two after I write it.     Do you have a comment about something I have written? This is a diary, not a “blog”, and there is deliberately no provision for directly adding comments. But I welcome feedback and try to reply to all messages I receive. See the diary overview for more details. If you do send me a message relating to something I have written, please indicate whether you'd prefer me not to mention your name. Otherwise I'll assume that it's OK to do so.


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