Dynapik offers a free online tool to change image types - no need to download anything. It's quick and easy to use. You can change your CRW images to PBM format. This tool works for both professionals and casual users. Convert your images to PBM in seconds.
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Canon RAW (Legacy)
The ancestor of modern Canon raw formats.
CRW (Canon Read/Write) is the original raw image format used by early Canon digital cameras, such as the EOS D30, D60, 10D, and the original Digital Rebel (300D). It predates the CR2 format. Unlike modern raw formats that are typically TIFF-based, CRW uses the CIFF (Camera Image File Format) structure. It often comes paired with a .thm (thumbnail) file, which contains the preview image and metadata.
CRW files store raw sensor data, usually 10-bit or 12-bit. The file structure is quite different from CR2/CR3, organizing data into a heap of 'chunks'. Because it is a legacy format, it does not support modern features like GPS tags or advanced lens profiles natively, though software can apply them in post.
CRW was used from 1997 until 2004. It was replaced by CR2 because CRW had limitations in file size and metadata extensibility.
Portable Bitmap
The lowest common denominator of image formats.
PBM (Portable Bitmap) is the simplest format in the Netpbm suite, designed to represent monochrome (black and white) images. It uses a straightforward text-based (or simple binary) encoding where '1' represents black and '0' represents white (or vice versa depending on the viewer, though standard entails 1=black). It was designed to be easily emailed and processed by simple scripts.
There are two variants: P1 (ASCII) and P4 (Binary). ASCII P1: The file is human-readable text. A grid of 0s and 1s defines the image. Binary P4: The bits are packed into bytes for efficiency. The header simply states the magic number (P1 or P4) and the dimensions. There is no compression, no index, no palette.
Invented by Jef Poskanzer in the 1980s as a way to send bitmaps via email properly. It became the foundation of the 'pbmplus' (later 'netpbm') toolkit, which provided a standard way to convert between dozens of incompatible 80s file formats.
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