How to reduce the size of the jpg file, not the size of pixel?

I prepare images for the web and I really have 2 questions: one on gifs and the other on the jpg files.
My standard procedure is to reduce the image to the desired at 600 dpi pixel dimensions
It gives me a little crisp image. can I use this what if the file size is quite low (I try for less than 600 KB) or convert to gif with the save for Web and devices.

Here are my 2 questions (I'll count this solved with each answer)

(1) when I convert a gif that I have 4 boxes: one with the original size, the other 3 with options but, often, the options are too low resolution for me how can I change my 3 options starting with a higher res gif?

(2) if I try to reduce the size of the jpg in the image size box I put the lower resolution (400, 300), which reduces the pixel dimensions and the size of the file, but I don't want to change the pixel dimensions. If I reset the dimensions in pixels to the size I want, even if it is a lower resolution that the file size does not change. How to reduce the size of the jpg file using only the resolution, the pixel dimensions not?  PS I tried to play with the checking and unchecking the 3 small boxes (scale of styles, constrain the proportions and re - sample) but nothing has worked.

GIF is not a type of large file, especially if you want a sharp image. What are the dimensions of the pixel?

For the web, it is immaterial that the dpi is, only the last pixel dimensions, so once you have that you want to use 'save for Web and devices' and you can reduce quality - 100% being the maximum and 0% being the lowest. I wouldn't save anything less than 55%. For an image of 600 KB, the size must be large enough.

Tags: Photoshop

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