Karls RAF Journey. Pt1. Airfix 1/72 Spitfire Mk.1a.

[KarlW]

Another short shed session tonight, I think the pattern is about right.
Just a little bleeding which caused my to learn a thinner soaked cotton bud will take you to bare plastic.....

I really need to turn whatever lamp is causing those yellow bars off when taking pictures with my phone.

[Tim Marlow]

Looking good Karl. Can’t see any yellow bars apart from those on the cutting mat though……

[adt70hk]

Coming on nicely Karl!

[yak face]

Great work karl , my iPhone sometimes messes about with the colours too , it depends upon the background colour , something way too complicated for me to understand but I just try a few different backgrounds to see what the colours look like when taking the final pics. An example is my own airfix 1/72 spitfire I did a while back for the BOB group build.I used a black background and it made the colours look really washed out , but when photographing a silver or natural metal subject black really makes it stand out .

[KarlW]

Great work karl , my iPhone sometimes messes about with the colours too , it depends upon the background colour , something way too complicated for me to understand but I just try a few different backgrounds to see what the colours look like when taking the final pics. An example is my own airfix 1/72 spitfire I did a while back for the BOB group build.I used a black background and it made the colours look really washed out , but when photographing a silver or natural metal subject black really makes it stand out .

I do have a proper camera, but the phone is handier for quick shots in the shed.
My lamp has flouro tubes and my overhead is LED, I suspect the flicker from the tube lamp is causing some sort of interference at the image sensor on the phones camera. Didn't get it with my old phone though so that's progress for you........

[Tim Marlow]

The picture issues you are describing are a combination of the light source and the algorithm used by the camera when taking JPG images Karl.
The fluorescent tube is probably a “warm” colour temperature one. These are favoured in temperate climates, and by emphasising yellow and red tones make us feel warmer in the colder darker winter months. They are analogous to the old fashioned yellow tinged bulbs used for very many years. Apparently those in tropical climates prefer cool blue toned tubes for precisely the opposite reasons. They give the user a sense of being cooler……..
The phone camera takes JPEG pictures. These are post shot processed by an inbuilt enhancement algorithm designed to emphasise the same tones to make the picture “pop” and be brighter and more appealing to the viewer. You can’t switch this off, it is an integral part of the JPEG image, and is why photography enthusiasts and professionals shoot in what is called RAW format. RAW is not manipulated in any way and shows exact what is seen by the sensor on the camera. The photographer can then process the image on software such as photoshop and only bring in the enhancements they want.
Combined, these aspects could well be responsible for the anomalies you see. If you want to minimise it for your model shots, just use a mid grey background in place of the cutting mat. This should help the sensors get the correct exposure and also minimise any over enhancements and colour casts.


Still think it looks good though :thumb2:

[KarlW]

Tubes are actually daylight temperature tubes, the LEDs are "cool white" which are better than the "warm white" you can also get.

[yak face]

I do have a proper camera, but the phone is handier for quick shots in the shed.
My lamp has flouro tubes and my overhead is LED, I suspect the flicker from the tube lamp is causing some sort of interference at the image sensor on the phones camera. Didn't get it with my old phone though so that's progress for you........

I found that mains AC led lights give that flicker which really confuses the light sensor on the phone or camera , the image can look vastly different on successive shots . I started using battery powered led lights as the DC current doesnt give the flicker. Still dont know why the different colour background messes with the colours though, some sort of techno witchcraft thats beyond me !

[Tim Marlow]

Tubes are actually daylight temperature tubes, the LEDs are "cool white" which are better than the "warm white" you can also get.

Just the phone trying to make the green (dominant colour) pop by enhancing the yellow content then Karl……

[Guest]

You can’t switch this off, it is an integral part of the JPEG image

It’s an integral part of the camera software you’re using on the phone. JPEG just encodes the pixels and usually a colour profile,¹ but the camera software does the processing you talked about and saves that as part of the JPEG it produces. I’ve never looked into it, but I suppose there must be different apps for taking pictures with that don’t do this kind of thing?

FWIW, I would recommend not taking photos of models with a cluttered background, but use a fairly even-coloured one — just a sheet of coloured paper or thin card that you can buy in any stationer’s or craft shop will do fine. Also, I tend to switch on the HDR option on my iPad when taking model photos, especially ones where there is little contrast between colours (like white plastic card against grey kit parts) because it generally produces photos in which the details are more visible.


¹ That last one is a kind of specification of how the phone’s camera sees colours, so that other devices can change the colours they display to hopefully match.

[Tim Marlow]

Still dont know why the different colour background messes with the colours though, some sort of techno witchcraft thats beyond me !

In basic terms Tony it’s because our eyes and brain show us what the colour “should” be and the camera shows us what it actually is.

[KarlW]

Same picture, flouro tubes off, no interference cast.
I do have a shooting table with an infinity curve some where, moved house losing a bedroom and garage in the process, still not recovered everything from everywhere it went while getting a shed built. But for quick WIPs the bench will do.

[Tim Marlow]

It’s an integral part of the camera software you’re using on the phone. JPEG just encodes the pixels and usually a colour profile,¹ but the camera software does the processing you talked about and saves that as part of the JPEG it produces. I’ve never looked into it, but I suppose there must be different apps for taking pictures with that don’t do this kind of thing?

That’s correct Jakko, I never made that clear. The various selectable picture modes (landscape, portrait, snow scene etc) actually use a different post processing algorithm to enhance that particular scene…….JPEG also significantly compresses the image file size to save space, by the way. This can lose fine detail, but would probably only be noticeable in larger image sizes.
As I said above, if you don’t want that sort of processing in your picture shoot in RAW mode. The files are much larger but are generated exactly as the sensor sees them. It’s not an app, it’s processing free. It just saves the picture direct from the sensor without any image processing. On an IPhone, for example, you apparently use Apple ProRAW as your setting.

[Tim Marlow]

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Same picture, flouro tubes off, no interference cast.
I do have a shooting table with an infinity curve some where, moved house losing a bedroom and garage in the process, still not recovered everything from everywhere it went while getting a shed built. But for quick WIPs the bench will do.

Like that! Shows the importance of lighting. We have to think for the camera because they are pretty dumb objects at the end of the day :nerd:

[Mark1]

I get the same stripes on my phone when taking a picture,its interference from the led lamp,dosnt show so bad in picture after its taken though.