New answers tagged srgb
As it was said, lossless is not an option here. To minimize losses throughout the workflow you can use ArgyllCMS. It is a free opensource pre-press quality library for colour conversion and other colour-related things, like profiling. It has a utility cctiff which handles colour space conversions for TIFF and JPEG files. Argyll comes with its own sRGB.icm ...
It appears that the image uses CMYK (as opposed to RGB) color model. Besides ensuring that your image is converted to sRGB and tagged as sRGB, you also need to convert it to RGB. If you save the results as PNG instead of JPG, you won't induce any further compression-based image loss.
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