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 PNG24 format. This tool works for both professionals and casual users. Convert your images to PNG24 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.
PNG-24 (24-bit RGB)
The standard for opaque, true-color lossless images on the web.
PNG-24 is the standard version of the PNG format for opaque, full-color images. It supports 24-bit color depth, which allows for over 16 million distinct colors (True Color)—the same color range as a standard JPEG. Unlike JPEG, however, PNG-24 uses lossless compression. This means it preserves every single pixel exactly as it was created, with absolutely no blurring or artifacts. This makes PNG-24 the ideal choice for complex graphics, screenshots, and detailed diagrams where quality is paramount and transparency is not needed. Note that while 'PNG-24' is often used to refer to any true-color PNG, strictly speaking, it refers to the RGB variant without an alpha channel. If you need transparency, you are technically using PNG-32 (RGB + Alpha).
A PNG-24 image consists of three color channels: Red, Green, and Blue. Each channel uses 8 bits of data per pixel, resulting in 24 bits total (8+8+8). This allows for 256 levels of intensity for each primary color, combining to produce 16,777,216 possible colors. Because it lacks an alpha channel, every pixel in a PNG-24 file is fully opaque. While the PNG specification allows for a 'tRNS' chunk to define a single specific color as transparent (similar to GIF), this is rarely used in modern web design in favor of the full alpha transparency found in PNG-32.
PNG-24 was part of the original PNG 1.0 specification released in 1996. It was designed as a direct, patent-free competitor to JPEG for lossless image storage. While JPEG won the war for photographs due to its superior compression ratios, PNG-24 became the standard for screenshots, diagrams, and digital art where preserving exact pixel values was more important than file size.
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