08-11-2019
UNIX tool on MacOS that can increase resolution of a file
hi,
I am searching for a native tool on MacOS that can increase the resolution of a group of image files whose aspect ratios (file width versus height) vary widely. There are numerous files so I don't wish to do this manually. Someone suggested the sips command with the resampling option but it appears this requires you to input a desired width and height. As found on the sips man page.
Is there some other UNIX command that can do what I wish? All I need to do (I think) is increase the number of pixels so that when the image is blown up then it appears smooth and not grainy or 'washed-out'.
thanks so much for your suggestions.
postscript - These image files are used in an iOS program and the problem appears on the large screen sizes of the ipad pro third generation.
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LEARN ABOUT DEBIAN
xpsetimageresolution
XpSetImageResolution(3Xp) XPRINT FUNCTIONS XpSetImageResolution(3Xp)
NAME
XpSetImageResolution - Sets the resolution for subsequent PutImage requests
SYNOPSIS
cc [ flag... ] file... -lXp [ library... ]
#include <X11/extensions/Print.h>
Bool XpSetImageResolution ( display, print_context, image_res, prev_res_return )
Display * display ;
XPContext print_context ;
int image_res ;
int * prev_res_return ;
ARGUMENTS
- display
Specifies a pointer to the Display structure.
- print_context
Specifies the print context on which to set the resolution.
- image_res
Specifies the image resolution in pixels per inch.
- prev_res_return
Returns the previous image resolution in pixels per inch.
DESCRIPTION
XpSetImageResolution returns True if the printer server allowed the resolution to be set, otherwise False is returned.
XpSetImageResolution sets the resolution for subsequent PutImage requests to the screen of the specified print context. If the return value
is False, then the print server does not support image scaling for the particular resolution given the current configuration of the
printer, and the application is responsible for any desired scaling. If the return value is True, then the contents of any subsequent
PutImage request to a Pixmap or to a Window on the screen of the specified print context will automatically be scaled as part of the PutIm-
age request. The scale factor is:
default_printer_resolution / image_res
Where default_printer_resolution is the current value of that page attribute. Only the image itself is scaled (meaning the effective width
and height of the image change), the dst-x and dst-y parameters to PutImage are not altered.
As a special case, a value of zero for image_res resets the resolution to automatically track the printer resolution; in this case (which
is also the default setting for a newly created print context), subsequent images will not be scaled.
If the return value is True and prev_res_return is a non-NULL pointer, then the previous image resolution that was set for the print con-
text is stored in prev_res_return.
XpSetImageResolution returns False immediately if image_res is negative or greater than 65535.
DIAGNOSTICS
XpBadContext A valid print context-id has not been set prior to making this call.
X Version 11 libXp 1.0.0 XpSetImageResolution(3Xp)