Morgan Ortiz6 said:I have a massive collection of images on my computer in all sorts of different dimensions, and I need to downsize them all to exactly 12x8 cm. I've experimented with several programs that claim to offer resizing capabilities, but the fundamental issue is that they all seem limited to resizing by pixels or percentages; none of them allow me to specify dimensions in centimeters.
Does anyone know which program actually offers this specific feature?
If you are attempting to execute this task via a batch process—essentially a one-click solution for the entire folder—it simply isn't going to work the way you expect for reasons that aren't even particularly relevant right now, except in one very specific scenario. If I recall correctly, no standard resizing tool will ever provide a "canvas" option (like setting a fixed 12x8 frame) because of the inescapable reality of aspect ratio. You are strictly limited to either a percentage change or resizing based on height or width in pixels. Furthermore, converting centimeters to pixels is entirely dependent on the required DPI of those photographs; for instance, 12cm at 72 DPI translates to roughly 340px, whereas 12cm at 300 DPI results in 1416px.
Essentially, most resizers are designed to handle bulk reductions of high-resolution files from an iPhone or a DSLR where the aspect ratio and DPI remain constant—for example, a standard 16:9 ratio at 72 DPI—where the primary objective is merely managing excessive pixel density.
To put it bluntly: if you have a mountain of photos taken with a digital camera and you want them all to be 12cm wide at 72 DPI, you simply input a width of 340px. The height will then be calculated automatically according to the existing aspect ratio of those individual images.
By the way, what is the end goal here? Are you sending these to a local print shop? If so, did they bother to tell you what DPI requirements they have for the final prints?
