将EPS转换为具有正确尺寸的Tiff Imagemagick

Question

I have a lots of EPS image with variable sizes, some are very small and some are large. When i open EPS image in Photoshop it can be resize to any bigger size without actually decreasing the quality. I have no problem converting EPS to TIFF, I even don't have resize problem if source EPS image is bigger in size, but when it comes to converting small EPS file, the converted TIFF doesnt look good.

Is there any way to resize the source EPS on the go so that quality is not lost and then convert it to TIFF file? Here is the code i have got

exec(_IMPath_.$srcimagepath." -colorspace cmyk -compress none -units PixelsPerInch -density 300 -quality 100 ".$cmykpath); 

Thanks