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 ERF images to JNG format. This tool works for both professionals and casual users. Convert your images to JNG in seconds.
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Epson RAW
The raw format for the cult classic Epson R-D1.
ERF is the raw format used by the Epson R-D1, the world's first digital rangefinder camera. Released in 2004, the R-D1 is a cult classic among camera enthusiasts for its analog handling (it even has a film advance lever to cock the shutter). ERF files contain the raw data from the camera's 6-megapixel CCD sensor.
ERF is a TIFF-based raw format. It is relatively simple compared to modern formats, storing 12-bit data.
Epson only made one digital camera line (R-D1, R-D1s, R-D1x). The format died with the discontinuation of the R-D1x in 2014.
JPEG Network Graphics
JPEG compression with PNG transparency.
JNG (JPEG Network Graphics) is a sub-format of the MNG animation format. It was designed to combine the high compression of JPEG with the alpha transparency features of PNG, something that standard JPEG lacks. It essentially wraps a JPEG stream and a mask channel in a chunk-based container.
A JNG file structure mimics PNG. It uses a 8-byte signature and chunks. The image data is split into a color chunk (JDAT) which contains JPEG data, and an alpha chunk (IDAT) which contains PNG-compressed alpha mask. This allows for 'lossy color, lossless alpha' images, which is very space-efficient for photographic sprites.
Created by the PNG Development Group around 2001 as part of the MNG (Multiple-image Network Graphics) project. It failed to gain traction as MNG was rejected by Mozilla and Chromium in favor of APNG and later WebP.
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