Custom cropmarks Edit
- Create a 720x480 image (or any other resolution with 3:2 ratio) using the 8-bit palette shown. Only the first 20 entries have constant color (the other entries are camera-specific).
- The cropmark image will be stretched to 3:2 and will cover the entire LiveView image area.
- Color 0 and 16 is transparent. Color 20 is semi-transparent.
You can also use this feature for custom composition grids. See CHDK grids page for ideas. You need to convert the grids to 720x480 BMPs, of course.
There may be tools available for converting CHDK's grd files to plain image formats.
You may use remap.py for converting any image to the correct palette. The script converts pure white to transparent and pure black to semi-transparent black.
Photoshop step by step guideEdit
This is done from Apple OsX (Snow Leopard/Lion) using Photoshop but I think that it could be done with any other software or operating system (with the right corrections).
- Create a new document with these settings (and consider saving them as a preset):
- Pixel size 720x480 resolution 72 pixel/inch;
- Color Mode: RGB Color, 8 bit;
- Background Contents: White;
- Color Profile: Don't Color Manage this Document
- Pixel Aspect Ratio: Square Pixels
- Edit your document and draw your cropmark, white will be transparent, 95% black will be semi-transparent black,
- NOTE: For 4:3 screens, try to avoid 1-pixel lines and 50% patterns, as you get aliasing and moire on the bitmap overlay, 3:2 screens don't have this problem;
- Before saving it as BMP you need to convert it to "Indexed Color" mode: Select from Image->Mode menu "Indexed Color", NOTE: this will flattern your levels and if you are already in indexed mode to see the Color Table window go to Image->Mode menu and select "Color Table..." ;
- On the new window chose "Table: Custom" in the drop down menu and press "Load..." to load the color palette (MLcolortable.zip) (file hosted on MediaFire) (you can make your own extracting it from a screenshot bmp made from ML);
- Set Dither: None
- NOTE: colors can have been changed now specially if your cropmarks if fulll of shades of grey or colors. So now it's time for a color check and correction.
- Click on File-> "Save as..." and select BMP for the Format, then use this settings for the BMP options:
- File Format: Windows;
- Depth: 8 bit;
- uncheck Compression (RLE);
- uncheck Flip row order;
- To have a usable RLE compressed .bmp (required only for 60D and 1100D, but good for saving memory on all camera) we need to use the Sztupy's tool (convertrle.rb ). NOTE: the compress RLE function in photoshop don't make an usable cropmark (it will hang your camera)
- Download the file:
- from ML repo and go on with step 2;
- or ML Color Palette here (file hosted on MediaFire) and skip to step 3;
- Download the file:
- From Terminal write: "sudo chmod +x " without brackets and then drag convertrle.rb in Terminal's windows (this is needed only the first time to make the .rb file executable. Without this step you will have permission denied error);
- to compress the bmp image we made just drop convertrle.rb into Terminal and then drop the image you need to convert, you will end up having: path/to/convertrle.rb path/to/imagetocompress.bmp
- hit enter to confirm and you will see a new file with extension .rle in the same folder of the original uncompressed .bmp
- copy it to your cropmks folder on ML card and remove the .rle extension so to have filename.bmp
NOTE: Last step is done from Apple OsX, on other system the procedure could not be the same. Ruby is required so check first to have it installed (I suppose it's installed by default on OsX).
ScraxIT 17:20, May 21, 2012 (UTC) UPDATED GUIDE, added a zip with ML color palette for photoshop and executable converterle.rb (to skip step 1 and 2 when using the script).
Photoshop step by step guide (Video)Edit
Image Magick as Image Editor Edit
Image Magick is an open source software suite for image manipulation and runs on a variety of operating systems.
Rather than using Photoshop, I tried to quickly make a custom cropmark by converting an image by using Canny Edge Detection. The input image was a screenshot of an old fighter jet that was not in the correct (720x480) dimensions, or (3:2) ratio. White becomes transparent in the cropmark, other colors have varying degrees of visibility when used. Canny created an image on a black background of the aircraft outline in white, which using the "-negate" could be turned into a white background with black aircraft outline.
I converted the image from PNG to BMP and copied it into the CROPMKS directory and it displayed a garbled screen of noise when I selected the freshly added cropmark.
Noting that the dimensions were incorrect, I created a new canvas of 720x480 and then using a -geometry offset I positioned the smaller image "atop" the larger, 720x420 canvas.
Copying this new image as a BMP into the CROPMKS directory, I found I could select the new cropmark, but that it did not overlay the aircraft's outline in the viewfinder.
Looking at the notes for Photoshop above, I added a param to set the bit depth to 8, though Magick's "identify" command had previously told me that the image was already using that bit value.
$identify CROPVAMP.BMP CROPVAMP.BMP BMP 720x480 720x480+0+0 8-bit sRGB 256c 16036B 0.010u 0:00.029
When I copied the CMP onto the SD card, the new cropmark was accessible and produced the overlay in live-view that I had been seeking.
Here is the input image and the output after Canny edge detection had been inverted.
The process was iterative & I tried a few things such as taking one of the existing BMP's to modify, but I encountered the same lack of a visible overlay with the modified file, so reverted to creating a new file.
File permissions on the file did not need to be modified, but perhaps need to kept in mind.
To thicken the width of the edge displayed the following param was used
"-morphology Dilate Disk".
The thickened version provides greater visibility of the custom cropmark.
Question: I have been unable to convert a B&W cropmark BMP using convertrle.rb. The converted image (on a Mac) looks fine but when I load the cropmark image into cropmarks/ the cropmark is completely wrong (ie. shades of pink and other colors show up). Steps followed: 1) create B&W horizontal gradient image and use 256 color indexed color mode 2) use convertrle.rb 3) copy & renamed the resulting *.rle image. I have also tried the same thing using an image with only 2 colors (black and white). Any ideas?
Answer: You need to use the ML color palette.
Sample croppings Edit
There are many cropmarks available in the Magic Lantern Cropmark repository.
Here are some self-made cropmarks with the procedure described previously , I've used the aureas.png from the 550 repository and a lot of ispiration came from the CHDK grids pages.
All the files can be downloaded from here or you can use the png posted here to make your own if the link is down.
Aureal proportion and Cross Meter EditThe central cross has a meter scale to help in measurement for macro photography. NOTE: It is still experimental, i'm thinking on how better divide the scale.
Intersection points fo thirds lines is show with little red crosses.
Aureal proportion lines are in a dark pink (sort of...).
Simple Cross with 1/4 pointsEditA simple central cross with little red marks at 1/4 of the screen.
Cross Meter OnlyEditA central red cross with a meter scale in black.
Cross Meter X(treme)EditJust a test to see how complex I can go without problems...
Passport (new version, ISO/IEC 19794-5 compliant)EditThis is a guide for taking correct passport portraits with min and max heigth, eye level etc.
It has an ideal black outline to center the subject and a red rectangle where eyes need to be placed.
ScraxIT 15:55, August 18, 2011 (UTC)