Re: [Image-SIG] Default Structure of a 640x480 PIL BMP File?

[Wayne Watson]

Title: Signature.html

I'm definitely well beyond my student days. Two months ago I took it upon myself to add new features to a 2000+ line program,  authored by someone else, that use a special video camera and hardware to detect bright meteors, and produce video images, b/w. My prior experience with Python Win was limited to maybe a month of non-GUI work. No Tkinter or PIL. I've gotten a fair dose of Tkinter with dialogs and menus.  A few days ago I began looking at analytic features that I might want to add using the video images/frames.  My first question was what sort of video format is used? The answer seems to be a 640/480 b/w 8-bit pixel. That's it. No headers or anything else. Although the image, date/time, meteor track data are written to files, the files are not anything anyone else uses. The user can write individual frames in jpg and tiff. I began think of adding bmp; however, I was curious how bmp worked, and whether I had control over the bit depth. I understand the jpb and tiff have no headers--I think. As I understand, it bmp has several types of blocks before the image, dib, header, palette, I think.  If I'm going to have to provide them, I have yet to figure that out. At this point, I'm mostly curious about them. As I begin to play with PIL features, I will need a better understanding of how I can manipulate our raw images described above. For starters, I'd likely want to put a transparent image with compass points around a circle over the frames examined by the software, as the user plays the video back through the software. By the time I'm done I'll probably use many of the IP features of PIL. I'm quite familiar with IP principles, but not PIL. I'd much rather read a document than a Python program file such as BmpImagePlugin to get my answer. The 1.1.3 PIL handbook, your tkinter guide, and effbot material  is about all I've got. Fredrik Lundh wrote: On Fri, Apr 3, 2009 at 10:38 PM, Wayne Watson <sierra_mtnv...@sbcglobal.net> wrote: The only PIL document that I have available is the PIL-handbook-2.pdf, which describes 1.1.3. I can find nothing in it about the module you mention. I have some scattered PIL material, but it is of no help here. I did a Google, and see some references to it, but nothing explanatory. What document or web site would I find the description? If you have installed the library, you have the BmpImagePlugin module installed (this is a Python library, so the source for the BmpImagePlugin module is in a file called BmpImagePlugin.py). I find your question a bit puzzling, btw. Why would anyone create a BMP-writing library that didn't include a header and data when the BMP specification says that a BMP file contains a header and data? Is this some homework assignment? </F> -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.01 Deg. W, 39.26 Deg. N) GMT-8 hr std. time) The Obama Administration plans to double the production in solar energy from 1% to 2% of the total energy supply in the next few years. One nuclear reaction would do the same. Heard on Bill Wattenburg, KGO-AM "Less than all cannot satisfy Man." -- William Blake

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