Model photos the easy way

[Tim Marlow]

I’m leaning to the HDR photos with the old iPad, but there’s not much between with and without in these, IMHO.


I had expected a lot better, I know that. It’s probably an indicator of what most people photograph with their phones and tablets — that is, not scale models :smiling3: I want to try other camera apps, but all of those I’ve found so far on the app store are subscription-based, and I refuse to pay for software-as-a-service when they’re just delivering me a product. (If they were offering some actual service, like cloud-based storage, a multi-player online game, or something like that, then sure, I’ll pay a regular fee to be able to keep using it, but not for something that’s really just a single product that lives entirely on my iPad.)


I’ve been playing with the pre-set filters, and it looks like a few of them change the colours enough to appear much more muted. I can live with applying a filter to photos, but I wouldn’t want to colour-correct each and every model photo by hand with all the different sliders available for that.


I haven’t tried that, but I do intend to see what happens with different colours of background. I would have to find something to use as a neutral grey one, though — my only easy alternatives are white and blue.

Blue or lilac might actually be a better background, certainly for colour balance. That way you are filling in the colour wheel when the subject is predominantly one colour like the yellow ones are.
I think the issue with the HDR shots is that the software tries to range the picture all the way from black to white, even if those tones don’t appear in the image. It would be interesting to see an exposure graph of those shots side by side with uncorrected ones. I bet all it does is spread the frequencies to fill the range of the graph.

[Guest]

Unfortunately, getting the uncorrected pictures out of the standard iPad camera app isn’t going to happen, AFAIK. But if I find a good alternative that can take RAW pictures, it might be worth experimenting with taking the same picture in both.

[Guest]

More experimentation, now with the background colour. I’ve done some more painting on the models, so they’re not the exasct same colour anymore as before, but I’ve now photographed the camouflaged Jagdtiger against four different backgrounds, and again, see for yourself:

[ATTACH]509741[/ATTACH][ATTACH]509742[/ATTACH][ATTACH]509744[/ATTACH][ATTACH]509743[/ATTACH]

The black background is much as before (of course), while the medium grey background produces more muted colours, as does the blue. However, these both still distort the colours to a fair degree. The green is OK, but the brown is too dark and the dark yellow is much lighter than on the real thing. The white background gives probably the best colours compared to the model, except it’s too dark overall (which, of course, is to blame on the light background, which results in the camera app making the rest of the picture darker).

[Tim Marlow]

I’d say the mid grey has the best exposure of those shots, but that the jpeg algorithm is still messing with the colours.

[Tworrs]

Thanks for that test Jakko, it is very interesting how the camera reads the overall light, and then compensates in the end result for the differences.
It does however make it a bit of a minefield though for the average person.

[Guest]

I’d say the mid grey has the best exposure of those shots, but that the jpeg algorithm is still messing with the colours.

The camera app’s processing messes with the colours, not the JPEG algorithm. Here’s the “grey” photo with its background erased in Photoshop and different colours swapped in place, saved as JPEGs with a colour profile (sRGB IEC61966-2.1) included:



When cycling through them in Quick Look, I don’t see any difference in the colours on the Jagdtiger itself. (You can do the same right here on the forum by clicking on one of the thumbnails above and then using the left and right arrows to the sides of the image to cycle through them.) If I open the digital colour meter, put the mouse cursor over a random spot on the Jagdtiger and cycle through the images, the colour values shown in the program don’t change at all.

[Guest]

it is very interesting how the camera reads the overall light, and then compensates in the end result for the differences.

This is a very useful thing if you’re taking generic photographs, of people, landscapes, etc. but not for the kind of semi-technical photography we do with models

It does however make it a bit of a minefield though for the average person.

And oddly, a lot more so than with my eight-year-old iPad … That also sometimes did things like this, but nowhere near as bad. I guess the latest hardware and software allows much greater adjustments to be done automatically. I just wish there was an easy way to turn that off …

[Tim Marlow]

The camera app’s processing messes with the colours, not the JPEG algorithm. Here’s the “grey” photo with its background erased in Photoshop and different colours swapped in place, saved as JPEGs with a colour profile (sRGB IEC61966-2.1) included:

[ATTACH alt="Grey.jpg"]509798[/ATTACH][ATTACH alt="Pink.jpg"]509799[/ATTACH][ATTACH alt="White.jpg"]509800[/ATTACH][ATTACH alt="Yellow.jpg"]509801[/ATTACH]

When cycling through them in Quick Look, I don’t see any difference in the colours on the Jagdtiger itself. (You can do the same right here on the forum by clicking on one of the thumbnails above and then using the left and right arrows to the sides of the image to cycle through them.) If I open the digital colour meter, put the mouse cursor over a random spot on the Jagdtiger and cycle through the images, the colour values shown in the program don’t change at all.

Yes, but the device shoots in RAW and then processes and saves them originally using a JPEG algorithm before you view them Jakko. It’s what separates these devices from SLR cameras. On my good camera I can shoot in RAW (unprocessed) and then do post photo processing in a program such as lightroom. All moot these days though, using the iPad as a point and shoot is far easier for web posting such as this.

[Guest]

Yes, but the device shoots in RAW and then processes and saves them originally using a JPEG algorithm before you view them Jakko

If we’re being precise, then Apple devices store the images as HEIC files internally, and only export to JPEG for things that want JPEG but not HEIC. This format may use JPEG compression, but not necessarily — and I don’t know what iPadOS does in this regard. In any case, my point is that the colour shift is not due to JPEG compression algorithms but due to the camera app’s processing of the raw image data it gets from the CCD.

The way JPEG compression works does mean that it will change the colours of pixels in the image, but not in response to the overall image tone — rather, for each 8 × 8 pixel block in the image, it will tinker with the colours that are least prevalent in that block, in order to compress the block more efficiently.