RE: Image Remove Perimeter White Space
Thanks! I'll give it a try in the am. All of the images are 512/512 or less(icons). Ralph DiMola IT Director Evergreen Information Services rdim...@evergreeninfo.net Phone: 518-636-3998 Ex:11 Cell: 518-796-9332 -Original Message- From: use-livecode [mailto:use-livecode-boun...@lists.runrev.com] On Behalf Of hh via use-livecode Sent: Wednesday, December 26, 2018 7:58 PM To: use-livecode@lists.runrev.com Cc: hh Subject: Re: Image Remove Perimeter White Space Here is a pure LC Script handler from one of my "early" images stacks. For large images this may become pretty slow... ## CROP image to opaque pixels on cropIt ft put the width of img ft into w; put the height of img ft into h put the maskdata of img ft into mData put numToByte(0) into c0 -- left and right transparency limits put w into cmin; put 1 into cmax repeat with i=0 to h-1 put i*w into h1 repeat with j=1 to cmin if byte h1+j of mData is not c0 then put j into cmin; exit repeat end if end repeat repeat with j=w down to max(cmax,cmin) if byte h1+j of mData is not c0 then put j into cmax; exit repeat end if end repeat end repeat put max(1,cmin-2) into cmin; put min(w,2+cmax) into cmax ## <- +border -- top and bottom transparency limits put h into rmin; put 1 into rmax repeat with j=cmin to cmax repeat with i=0 to rmin-1 if byte i*w+j of mData is not c0 then put i into rmin; exit repeat end if end repeat repeat with i=h-1 down to max(rmax,rmin) if byte i*w+j of mData is not c0 then put i into rmax; exit repeat end if end repeat end repeat put max(1,rmin-2) into rmin; put min(h,2+rmax) into rmax ## <- +border put (cmax-cmin+1) into w1; put (rmax-rmin) into h1 put the left of img ft into L; put the top of img ft into T crop img ft to L+cmin-1,T+rmin,L+cmax,T+rmax -- LC Bug: resizes instead of cropping when image has angle <> 0 end cropIt ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Image Remove Perimeter White Space
Here is a pure LC Script handler from one of my "early" images stacks. For large images this may become pretty slow... ## CROP image to opaque pixels on cropIt ft put the width of img ft into w; put the height of img ft into h put the maskdata of img ft into mData put numToByte(0) into c0 -- left and right transparency limits put w into cmin; put 1 into cmax repeat with i=0 to h-1 put i*w into h1 repeat with j=1 to cmin if byte h1+j of mData is not c0 then put j into cmin; exit repeat end if end repeat repeat with j=w down to max(cmax,cmin) if byte h1+j of mData is not c0 then put j into cmax; exit repeat end if end repeat end repeat put max(1,cmin-2) into cmin; put min(w,2+cmax) into cmax ## <- +border -- top and bottom transparency limits put h into rmin; put 1 into rmax repeat with j=cmin to cmax repeat with i=0 to rmin-1 if byte i*w+j of mData is not c0 then put i into rmin; exit repeat end if end repeat repeat with i=h-1 down to max(rmax,rmin) if byte i*w+j of mData is not c0 then put i into rmax; exit repeat end if end repeat end repeat put max(1,rmin-2) into rmin; put min(h,2+rmax) into rmax ## <- +border put (cmax-cmin+1) into w1; put (rmax-rmin) into h1 put the left of img ft into L; put the top of img ft into T crop img ft to L+cmin-1,T+rmin,L+cmax,T+rmax -- LC Bug: resizes instead of cropping when image has angle <> 0 end cropIt ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Image Remove Perimeter White Space
> Ralph wrote: > I will just have to go pixel by pixel and check > left, top, right and bottom sides for any non-zero > RGB and delete rows/columns until one of the sides > has an RGB that is not zero. Here is a comparison value for that. Using javascript from a hidden browser widget autocropping to opaque pixels needs (incl. transport) for a 500x500 sized image around 100 ms. ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
RE: Image Remove Perimeter White Space
Thanks All! I was not totally clear. The area around the visible center is transparent(not white). I need to do this invisibly in real-time without user interaction. Luckily all the images are square so I don't have to worry about keeping the aspect ratio intact. I will just have to go pixel by pixel and check left, top, right and bottom sides for any non-zero RGB and delete rows/columns until one of the sides has an RGB that is not zero. Again... Just when I find myself "WAH"ing I remember this is LiveCode and things like this are not so bad to code. Ralph DiMola IT Director Evergreen Information Services rdim...@evergreeninfo.net ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Image Remove Perimeter White Space
On 12/26/18 5:13 PM, Ralph DiMola via use-livecode wrote: I am downloading various images from a customer with varying unpredictable amount of white space around the image. I want to make the visible center portion images the same size. Before I start coding is there any native LC way or existing example stacks that do this? If you mean to make all the images the same size and you aren't concerned about leaving out some content, then I'd create a temporary graphic with the right dimensions, center it over the loc of the customer image, and then: crop img "customerImg" to the rect of grc "tempGrc" If you want all the content to display, you can resize the longer edge of the image proportionately to fit inside the crop rectangle before cropping it. -- Jacqueline Landman Gay | jac...@hyperactivesw.com HyperActive Software | http://www.hyperactivesw.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Image Remove Perimeter White Space
> Ralph D.wrote > I am downloading various images from a customer with > varying unpredictable amount of white space around the > image. I want to make the visible center portion images > the same size. Assuming the white space around is symmetric, at least proportional to width and height, you could compute your "visible center portion" based on the loc of the image. Then use the crop command. The only difficulty with crop is to set the rectangle correctly. For this, setting the topleft of the image to (0,0) is helpful for me. For visible cropping you could wait for my cropTool that is able to crop solid color background (with selectable tolerance). It's coming in January 2019 (as a new years gift for the community) and already done, needs only more help and some "beautifying". ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Image Remove Perimeter White Space
Oh that's a pickle! Nothing native I'm sure. There is no telling from the image itself that you want "white" to equal "overlap" at least not without a mask of some sort. So it's going to be a pixel by pixel job, and then hope and pray that "white" actually means "0,0,0" as opposed to "1,0,0" or anything else. If the image was produced taking into account any kind of color workflow, that will likely not be the case. I suppose a better way would be to provide the end user with some kind of crop tool and let them draw and scale a transparent rectangle with visible border and handles, then crop the imported image accordingly. Alternatively just require the user to provide images of a maximum width and height, then alert the user if they select something which exceeds the parameters. That is not unusual to expect that from end users. For instance, Toshiba's new Elevate Web Portal allow the importing of a background image and a company logo, but the logo must be no larger than 256x256 and the background must be exactly a certain size. Toshiba has no compunction requiring us to follow those guidelines. Bob S > On Dec 26, 2018, at 15:13 , Ralph DiMola via use-livecode > wrote: > > I am downloading various images from a customer with varying unpredictable > amount of white space around the image. I want to make the visible center > portion images the same size. Before I start coding is there any native LC > way or existing example stacks that do this? > > Thanks! > > Ralph DiMola ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
