Image Processing Using ImageJ
Norbert Vischer
Centre for Advanced MicroscopyUniversity of Amsterdam
Image processing Image AnalysisData Organization
From Images to Results
Full well capacity:15 000 electrons
Image as a matrix
4 MP camera:
1 MPixel red2 MPixel green1 MPixel blue
4 MP color image
4 MPixel red4 MPixel green4 MPixel blue
Missing fields are interpolated
Color images
File types
TIFF (Tag Image File Format) : 8-bit 16 bit, 32bit, RGB,
uncompressed in ImageJ
JPEG / JFIF: Lossy Compression, 1:25
GIF (Graphics Interchange Format) : 8 bit Graphics, Animation,
lossless
PNG (Portable Network Graphics): RGB Graphics, Transparency,
lossless, superior to GIF, for screenshots
DICOM
FITS
File types
- 8 Bit- 16 Bit- RGB color-32 Bit Floating point----------------------------- (Hyper-)Stacks- Metadata- Spatial calibration-Density calibration
- Only uncompressed TIFF in ImageJ
TIFF is the most versatile format
TIFF: A File system within a file
JPEG Compression / Decompression
JPEG Artifacts
8 * 8 cell
Bit depth of image types