[Gambas-user] Magnify 0.0.8

[Shane Powell]

On 21/04/11 08:11, richard terry wrote:
> On Thursday 21 April 2011 04:20:35 Matti wrote:
>> Hi Shane and Richard (and whoever, didn't follow the conversation),
>>
>> this is a nice idea!
>>
>> After trying it just once with a few images, a question: The lens
>>   magnifies, but definitely doesn't show the original size of the image. My
>>   test images are about 3200x2400, and your lens shows about 2/3 of the
>>   original size.
>> Is this a planned behaviour?
> The problem is that (with my lack of logic) there's been no proper
> implementation of the magnification.  Its much harder than you think.
> I think the current version 0.0.8 problem is that it is only magnifiying the
> image from the scaled image once loaded, and not the original, hence the
> detail blurs as you magnify.
>
> I sat down last night and tried a version which keep the original image in
> memory as an image, and then tried to calculate the start point of the zoom
> onn the original image, but got into a hell of a mess, it nearly did my head
> in!.
>
> After going to sleep on it I realised that to once you have the magnifier in
> action, that to start say with mag=1, you have to take into account the ratio
> of the  scaled image to the original real image - for example if the scaled
> down image was 4 units in area and the original 8 units in area, then to put
> into the circle on the screen the same info as already there from the
> original, the sampling size on the orginal would have to be twice as big.  As
> you magnify, the sample size on the original then gets smaller and smaller,
> but the information is then displayed in the same size circle on the scaled
> image, hence it is magnified.
>
> I sort of tried this last night and got really high definition magnification in
> the circle  (for example I could read the number plate on a car which was
> reasonably small in the original picture), whearas on 0.0.8, the whole thing
> was a blurr.
>
> So, me - not a mathematitian but that's my take on it, and Yes, I'd be happy
> to collaborate.
>
> It may be of interest to you, and this does work well, though I'm not sure how
> I would disentangle it from my medical records project, but I've got a great
> combination of the image editor + webcam form  with lots of enhancements I
> need, - I use it to take pictures of patients (for ID for their file) and to
> take macro pictures of skin lesions, which I then just shove into their
> progress notes, plus use it to insert line diagrams of for eg head, face,
> nose, abdo, draw on them to indicat e the site of a skin lesion to excise etc,
> then insert it into their progress notes. I tracked down a cute little macro-
> webcam - IPEVO2 I think it was - after finding even an expensive logitech
> wouldn't do the job. This webcam is a bit finickyi because the auto-focus hunts
> a bit under my fluro lights if the subject moves, but with an additional light
> source it works fine. I can even hold it up next to the Xray box and take
> really quite good shots of  a section of an Xray!!!!
>
> I'll take a look at your project over easter and we can all keep in touch.
>
> Regards
>
> Richard
>
>
>
>> Another question:
>> I'm working on an image viewer example for Gambas3.
>> What do you think about joining the projects, putting your magnifying glass
>> somewhere (Zoom menu probably) into the viewer as a menu item?
>> I didn't read your code and don't know if it could be integrated easily,
>>   but why not.
>> I just like the idea of having this option in the viewer, instead of having
>>   two different examples.
>>
>> So, have a look at my project and tell me what you think.
>> Don't complain about bugs! There have been some big changes, and a lot of
>>   the code isn't fixed yet.
>>
>> Regards
>> Matti
>>
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