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I'v just become a member, primarily because I needed to voice my opinion (and issue) with this plugin (Resize Cover). So forgive me if I was meant to start a new thread due the old age of this thread.
To continue... I just applied this plugin to some of my larger (pixel size) covers. I was interested to see what it might actually do the JPG file within the Calibre Library. I was a bit shocked to see that although the pixel dimensions reduced to what I'd set (446 x 680, based on paperback dimensions) the actual file rose in size. I've tested a few covers where the reduction wasn't huge (max 1000 pixels reduced to 680 pixels) but in each case the actual file rose in size between 20% and 50%.
As these are JPG files I know there is a "lossness" figure which can be utilized to reduce image size without "appearing to" lose quality. I'm wondering if the resizing function is attempting to use a 100% quality. If so, is there anyway to change this? I'm my usage of JPG files I've always found that a 90%-95% quality adjustment is more than adequate, in some cases I've used a 67%-75% adjustment where the quality wasn't quite so much an issue, just the ability to present an image, especially when sending them via email.
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