rui_mac Posted February 17, 2019 Share Posted February 17, 2019 When bitmaps are placed and scaled (up or down) in Publish, what is the interpolation method used? Also, what interpolation method is used when we Rasterize a bitmap layer? Sometimes, I would like to have a bitmap scaled using the Nearest Neighbor mothod. Other times, Bilinear or Lanczos. It would be great to be able to define a default method for all bitmaps in a document and, also, an individual setting, in the Resource Manager. Quote Link to comment Share on other sites More sharing options...
MikeW Posted February 17, 2019 Share Posted February 17, 2019 APb shouldn't be resampling at all. At least not destructively though it may be doing so for screen presentation, that I don't know. Quote Link to comment Share on other sites More sharing options...
MikeW Posted February 17, 2019 Share Posted February 17, 2019 I should also mention that resampling and what method is used at export time and can be then set. Quote Link to comment Share on other sites More sharing options...
Staff MEB Posted February 17, 2019 Staff Share Posted February 17, 2019 Hi rui_mac, It's probably doing the same as Photo/Designer: using bilinear from the nearest mip-map when scaling down and from the source when upscaling. rui_mac 1 Quote A Guide to Learning Affinity Software | Affinity Quick Reference Link to comment Share on other sites More sharing options...
rui_mac Posted February 17, 2019 Author Share Posted February 17, 2019 I know that images should not be resampled destructively. It would be just a matter of display, print and exportation. As it is now, it seems like a bilinear or bicubic method is being used for display/print. And I do know that I can set the interpolation method of resampling when exporting. But, it would be nice to be able to set a "bypass" method for individual images. For example, I write software manuals and I use many screen captures of dialogs and icons. Sometimes, I prefer to have those images enlarged with the Nearest Neighbor method, so that the image doesn't become "soft". Quote Link to comment Share on other sites More sharing options...
MikeW Posted February 17, 2019 Share Posted February 17, 2019 10 minutes ago, MEB said: Hi rui_mac, It's probably doing the same as Photo/Designer: using bilinear from the nearest mip-map when scaling down and from the source when upscaling. APub has no option to set what happens if rescaling like AD does. It may happen behind the scenes as APub stupidly has a document DPI (and just as stupidly a document color space) and so if an image has a higher DPI than the DPI in the document set up, I guess that's when it can do so. APub should absolutely not have a document DPI and it should not resample the original image at all. Quote Link to comment Share on other sites More sharing options...
Staff MEB Posted February 17, 2019 Staff Share Posted February 17, 2019 It only resamples them destructively when you rasterise the layers. rui_mac 1 Quote A Guide to Learning Affinity Software | Affinity Quick Reference Link to comment Share on other sites More sharing options...
rui_mac Posted February 17, 2019 Author Share Posted February 17, 2019 The best and most versatile way would be: - Have a document DPI (as it already has) to define the global resolution of the document and at what resolution should the images be resampled when printing or exporting. - Have a global interpolation method, as a document default. - Allow for each image to have an interpolation override. - Use the global or individual interpolation method of interpolation when a layer is Rasterized. Quote Link to comment Share on other sites More sharing options...
MikeW Posted February 17, 2019 Share Posted February 17, 2019 5 minutes ago, MEB said: It only resamples them destructively when you rasterise the layers. Well, that wasn't very clear in your previous reply, was it? APub does resample in the case of an image that is placed if that image has a higher DPI than the document set up. Why then isn't there the same option as in AD for a choice? Or is that not what that set up item in AD is for? rui_mac 1 Quote Link to comment Share on other sites More sharing options...
MikeW Posted February 17, 2019 Share Posted February 17, 2019 1 minute ago, rui_mac said: ...- Have a document DPI (as it already has) to define the global resolution of the document and at what resolution should the images be resampled when printing or exporting... DPI should only affect raster effects as per ID. QXP doesn't have such a thing and always handles effects at export only (which is the best method to me). rui_mac 1 Quote Link to comment Share on other sites More sharing options...
rui_mac Posted February 17, 2019 Author Share Posted February 17, 2019 I don't mind if the interpolation will only occur in the final stage (printing or exporting). But we should have a way to define individual interpolations, per image, and not a "one option serves all". Quote Link to comment Share on other sites More sharing options...
MikeW Posted February 17, 2019 Share Posted February 17, 2019 11 minutes ago, rui_mac said: I don't mind if the interpolation will only occur in the final stage (printing or exporting). But we should have a way to define individual interpolations, per image, and not a "one option serves all". If Serif leaves APub (and AD) the way it presently works, then I agree that there ought to be both a global and individual choice in interpolations. rui_mac 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.