Danne came up with yet another new setting for the EOSM that has a different full raw buffer size and it required a new focus pixel map file. He did a quick fix by simply copying and renaming the closest map file and it worked. However, I thought this might be a good opportunity to show how I create a new map file when this comes up because it seems to be a recurring theme.
The new setting has a full raw buffer size of 1808x769 and this is for the EOSM so we're looking for a file named 80000331_1808x769.fpm. That 80000331 is the camera code Canon assigned to the EOSM. When using MLVFS the map file has to fit exactly but with MLV App there is a little bit of wiggle room with the vertical size because we found that it sometimes varies slightly and it is always plus or minus on the bottom few rows. The closest match in the current repository is 80000331_1808x759.fpm which is outside of the tolerance allowed by MLV App so we need a new map file. Danne found out that by simply changing the name of that map file it worked. We could just leave that as is but if for any reason there are some focus pixels in the new area at the bottom of the frame we'll miss mapping them out.
First of all, copy the 80000331_1808x759.fpm file along with the fpm2img.sh and img2fpm.sh scripts from the
focus pixels repository into a working directory. Next, rename the file to 80000331_1808x769.fpm. This will allow us to create a graphic image file with the right dimensions using the fpm2img.sh script.
rosiefort@Rosie-Forts-Computer ~ % cd Desktop/wip
rosiefort@Rosie-Forts-Computer wip % ls
80000331_1808x769.fpm fpm2img.sh img2fpm.sh
rosiefort@Rosie-Forts-Computer wip % ./fpm2img.sh 80000331_1808x769.fpm
output_file = 80000331_1808x769_1.pbm
input_file = 80000331_1808x769.fpm
input file type = fpm
width = 1808
height = 769
Mapping focus pixel x,y coordinates:
1806 0758
Filling in remaining pixels
00000000
output_file = 80000331_1808x769_2.pbm
1803 0755
Filling in remaining pixels
00000000
output_file = 80000331_1808x769_3.pbm
Filling in remaining pixels
00000000
Converting from PBM to PNG image file format
Ok, what just happened? You got not one but three graphic files?
It so happens that this is a multi-pass map file. Perhaps we had two different settings with the same full raw buffer size that showed the focus pixels in different locations. In addition, this being the EOSM which is always in Live View mode it will sometime overlay focus pixels for the "native" 720x480 resolution of the LCD screen. At least that's what we believe might be happening. We need to run the map files one at a time otherwise the pixel blending algorithm that is hiding the focus pixels gets overwhelmed and will possibly start contaminating the pixels it is trying to hide with nearby focus pixels and it turns into quite a mess. What the script did was to create separate graphic image files for each pass. Let's take a close look at the bottom few rows in an image editor, Photoshop in this case:
Those bottom few rows are blank and we should fill them in. I copied the background layer, changed the blending mode to "Darken" and moved down the new layer until the pattern matched up and filled in the bottom rows. Then I exported a PNG file. That format seems to work fine for this purpose. If you have ImageMagick installed on your system the scripts I wrote should work with it and save small PNG files, the script itself works with plain text PBM files which is an ancient format that creates huge files but it is easy to manipulate with very simple shell scripts.
Next, turn each of these PNG files back into FPM files:
rosiefort@Rosie-Forts-Computer wip % ./img2fpm.sh 80000331_1808x769_1.png
input_file = 80000331_1808x769_1.pbm
output_file = 80000331_1808x769_1.fpm
width = 1808
height = 769
Finding mapped pixel x,y coordinates:
Converting pbm file to png to save space.
rosiefort@Rosie-Forts-Computer wip % ./img2fpm.sh 80000331_1808x769_2.png
input_file = 80000331_1808x769_2.pbm
output_file = 80000331_1808x769_2.fpm
width = 1808
height = 769
Finding mapped pixel x,y coordinates:
Converting pbm file to png to save space.
rosiefort@Rosie-Forts-Computer wip % ./img2fpm.sh 80000331_1808x769_3.png
input_file = 80000331_1808x769_3.pbm
output_file = 80000331_1808x769_3.fpm
width = 1808
height = 769
Finding mapped pixel x,y coordinates:
Converting pbm file to png to save space.
Finally, copy these map files one after the other in order to create a multi-pass map file:
rosiefort@Rosie-Forts-Computer wip % cat 80000331_1808x769_1.fpm 80000331_1808x769_2.fpm 80000331_1808x769_3.fpm > 80000331_1808x769.fpm
I'll save you the trouble on this one and update the repository with this new map file.
Note that next month Bitbucket will no longer support Mercurial repositories. Both the main Magic Lantern repository as well as my ML Focus Pixels repository are Mercurial so they need to be converted or moved to another hosting site in order to continue this project. I would appreciate it if someone takes over the focus pixel repository because I have moved on to other projects and don't have much reason to continue maintaining it.
