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| --- Log closed Wed Apr 23 10:38:04 2014 |
| --- Log opened Wed Apr 23 10:40:32 2014 |
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| 20:56 | <@celticminstrel> | Whoa, "difference" mode in GIMP seems to work nicely for subtracting one image from another. |
| 20:56 | <@celticminstrel> | Identical pixels become black and can be selected with the wand. |
| 20:57 | <@celticminstrel> | ...dunno if it'll work for the case where I want alpha in the result, though... |
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| 21:31 | <@celticminstrel> | ...yeah, I'm not sure how I'd get what I want here. |
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| 21:33 | <@celticminstrel> | I basically want to invert alpha blending. |
| 21:36 | | Turaiel is now known as Turaiel[Offline] |
| 21:44 | <@celticminstrel> | Which from the sounds of it is super-easy, mathematically speaking. |
| 21:44 | <@celticminstrel> | So the question is how to get GIMP or ImageMagick to do it. |
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| 21:47 | <@ErikMesoy> | This sounds like one of those problems where I could help you if you described what you wanted in more detail, but if you could do that then you would already have solved it. >_> nevertheless, I have some experience with GIMP. What can I suggest? |
| 21:47 | <@celticminstrel> | Basically, I have image A and image B. |
| 21:48 | <@celticminstrel> | A is a background image. B is the same background image with an additional image superimposed on top. |
| 21:48 | | mode/#code [+o RchrdB] by ChanServ |
| 21:48 | <@celticminstrel> | I want to obtain image C such that superimposing C onto A gives B. |
| 21:48 | <@ErikMesoy> | Try the Subtract layer filter. |
| 21:48 | <@celticminstrel> | And I want C to have an alpha channel. |
| 21:48 | <@celticminstrel> | The subtract filter would work nicely, but for that last requirement. |
| 21:49 | <@celticminstrel> | (Or wait, it was the difference filter. Still.) |
| 21:49 | <@ErikMesoy> | close enough |
| 21:49 | <@ErikMesoy> | GIMP had alpha channel last I looked, though |
| 21:49 | <@celticminstrel> | Yes, it does. That's not the issue. |
| 21:50 | <@celticminstrel> | I can use the difference filter to produce an image C that, when superimposed on A, gives B; but that image C doesn't have an alpha channel and thus still contains bits of the colour of A. |
| 21:51 | <@celticminstrel> | From googling, it seems that what I want can be obtained by simply rearranging the alpha blending formula, but getting GIMP/ImageMagick to do that is the issue. |
| 21:51 | <@ErikMesoy> | Why doesn't image C have alpha channel? |
| 21:51 | <@ErikMesoy> | Do A and B have that in the first place? |
| 21:51 | <@ErikMesoy> | How are you producing C? |
| 21:52 | <@ErikMesoy> | When I test Difference Mode here I get something with alpha channel. |
| 21:52 | <@celticminstrel> | Okay, technically that way of producing C does give an alpha channel, but the alpha is either 0 or 1. |
| 21:52 | <@celticminstrel> | 0 or 255, rather. |
| 21:53 | <@celticminstrel> | Image B contains shadows and lighting, and I want to express that as alpha in the resulting C. |
| 21:53 | <@celticminstrel> | (Producing C: use the wand with "Sample Merged" checked, click the black area, and delete it.) |
| 21:54 | <@ErikMesoy> | Try bopping the two images into being layers of one image. |
| 21:54 | <@ErikMesoy> | Then use either Difference or Subtract filter on the topmost layer and Merge Down. |
| 21:54 | <@celticminstrel> | Uh, they already are. |
| 21:54 | <@celticminstrel> | Merge down won't give me what I want; the colours of B aren't correct. |
| 21:54 | <@ErikMesoy> | Layer merging should preserve interaction to a larger degree than select-delete |
| 21:56 | <@celticminstrel> | (Because they have A being subtracted from them. Or are being subtracted from A, depending on the ordering of the layers, but the result is the same; I checked.) |
| 21:59 | <@ErikMesoy> | Poke the Layer->Transparency menu a bit. |
| 21:59 | <@ErikMesoy> | I'm out of ideas. |
| 22:09 | <@celticminstrel> | ...I just realized, this might be harder than I thought. |
| 22:10 | <@celticminstrel> | There's a degree of freedom. |
| 22:10 | <@celticminstrel> | The equation contains four variables, and I only know two of them. |
| 22:11 | <@celticminstrel> | It might be sufficient to set the "new" colour to neutral grey, not sure. |
| 22:12 | <@celticminstrel> | Also... there are parts of the image that should definitely be opaque. |
| 22:13 | <@celticminstrel> | Bleh. Maybe later I'll write some sort of tool to do it. |
| 22:16 | <@celticminstrel> | I'm pretty sure I could do it pretty easily with some C++/SFML code |
| 22:38 | <@Tarinaky> | It always seems like a good idea to drink a fuckton of caffiene and pull an all-nighter to get some work done until I suddenly remember that large doses of caffiene gives me digestive problems and I don't have a working toilet. |
| 22:39 | <@Tarinaky> | MLIA |
| 22:41 | <@Alek> | I'd call that more of a FML. |
| 22:41 | <@Tarinaky> | I guess the MLIA is "I haven't started my dissertation. It needs to be due in a week" |
| 22:44 | <@Alek> | that's pretty A, indeed. |
| 22:52 | <@Tarinaky> | On a related note. I have two angles corresponding to location on a unit sphere. How do I convert these into x/y coordinates so I can meaure a distance? |
| 22:53 | <@Tarinaky> | Do I even need to? |
| 23:05 | | Turaiel[Offline] is now known as Turaiel |
| 23:09 | <&ToxicFrog> | Tarinaky: how do the angles correspond to location? |
| 23:14 | <&ToxicFrog> | I mean, if it's a unit sphere, then by definition the distance from origin to any point on the sphere is 1 |
| 23:19 | <@Tarinaky> | ToxicFrog: They're GPS coordinates. |
| 23:19 | <@Tarinaky> | ToxicFrog: But I'm ignoring the altitude reading |
| 23:20 | <@Tarinaky> | ToxicFrog: I want the shortest distance between the two points on the surface of the sphere... not the distance to the origin |
| 23:20 | <&ToxicFrog> | Shortest distance, or shortest distance along the surface of the sphere? |
| 23:21 | <@Tarinaky> | Also, after much cursing and inserting redundant assertions into my Python I determine the cause of the error is a lack of a return statement. Sometimes I wish Python made the damn things mandatory. |
| 23:21 | <@Tarinaky> | ToxicFrog: I don't think it matters by much, they're small distances. |
| 23:22 | <@Tarinaky> | But oestensibly distances along the surface. |
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| 23:25 | | * Tarinaky thinks she's done something wrong to get a silly-large number |
| 23:26 | <&ToxicFrog> | Ok, so, it seems like it should be a straightforward application of trig to turn (bearing, azimuth) into (x, y, z) |
| 23:27 | <&ToxicFrog> | Actually, here you go: http://en.wikipedia.org/wiki/Spherical_coordinate_system#Coordinate_system_conve rsions |
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| 23:34 | <@Tarinaky> | Ah wait. |
| 23:34 | | * Tarinaky herps. |
| 23:34 | <@Tarinaky> | The small angle approximation thingie only works for radians. |
| 23:34 | <@Tarinaky> | Right. |
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| 23:40 | <@Tarinaky> | Well, that gives me an even /bigger/ number :/ |
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| 23:46 | <@Tarinaky> | ToxicFrog: Am I possibly missing any gotchas here? I'm getting a speed in thousands of kilometers for a small foam UAV. |
| 23:46 | <@Tarinaky> | *groundspeed |
| 23:46 | <@Tarinaky> | I mean. This isn't Kerbal SPace Program :/ |
| 23:48 | <@Tarinaky> | Oh, hang on a tick... hmm. |
| 23:49 | <@Tarinaky> | Well, that gets me a slightly less Kerbalish speed of 270km/s |
| 23:49 | <@Tarinaky> | Which still seems obscene. |
| 23:52 | <&ToxicFrog> | Getting it from what? |
| 23:52 | <&ToxicFrog> | Without context I have no idea if those numbers are all reasonable. |
| 23:53 | <&ToxicFrog> | Also, 270km/s, 270m/s, or 270km/h? |
| 23:53 | <@Tarinaky> | Log files from a small foam fixed-wing UAV driven by an electric propeller motor. |
| 23:53 | <@Tarinaky> | 270 km/s unless I've stuffed a unit translation |
| 23:54 | <&ToxicFrog> | So |
| 23:54 | <&ToxicFrog> | At 270km/s, your UAV is well past solar escape velocity |
| 23:54 | <@Tarinaky> | This is why I describe it as only slightly less Kerbalish |
| 23:55 | <&ToxicFrog> | In Kerbal terms that's well past the point where The Kraken disassembles your rocket. |
| 23:55 | <&ToxicFrog> | IOW, you are doing it wrong somewhere~ |
| 23:55 | <@Tarinaky> | That much is obvious |
| 23:58 | <@Tarinaky> | I wish I had an easy way to pastebin from vim :/ |
| 23:58 | <@Tarinaky> | inb4 emacs |
| --- Log closed Thu Apr 24 00:00:35 2014 |