Image size issue when converting from RAW to TIF

The camera scanned RAW images are captured using 1300 D Canon Camera. The issue is that when converting Camera scanned RAW files into the TIF file. The RAW images are around 23MB - 35MB, but the converted TIF images are more than that of the size (around 60MB - 75MB).

While looking into this issue, we had to refer the following articles and the StackExchange answers to get a brief explanation for this issue.

The RAW images are 4000 X 6000 pixels size.

To get 400 DPI size images we have to divide both the height and width of the image by 400. The required TIF image size would be 6000/400 X 4000/400 = 15 X 10

To get 300 DPI size images we have to divide both the height and width of the image by 400. The required TIF image size would be 6000/300 X 4000/300 = 20 X 13.333

All the conversion are converted in between this range. Therefore, we don't have to worry about the conversion steps and the measurements while doing conversions. The conversion using TIF compression to convert RAW to TIF, TIF is lossless compression. We tried by using JPEG compression instead of TIF compression this gave 28MB RAW image to 14MB JPEG file. But, according to archive methodology JPEG is not a good format for archiving purposes. So, we have to change the pixels of the Camera used for scanning. That means, we have to change the camera used for scanning.