Image filtering in the graphic editor about slade HOT 4 CLOSED

Check that the 'gl_tex_enable_np2' cvar is set to 1 (type "gl_tex_enable_np2 1" in the console). If that isn't it, it's likely a driver issue (try updating them), or your graphics card is too old to support non-power-of-two texture sizes.

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I didn't mention that I am using 3.0.2 if it is of any significance.
The cvar you provided somehow doesn't seem to work for me in the console, but I checked the config file and it is set to 1 there.

My video card is indeed ancient, a Radeon x1600. They stopped supporting it years ago, the newest drivers are from 2011 or so. But it apparently does support NPOT textures. Here is the extensions list (taken from the DarkPlaces console dump):

GL_EXTENSIONS: GL_AMD_performance_monitor GL_ARB_depth_texture GL_ARB_draw_buffers GL_ARB_fragment_program GL_ARB_fragment_program_shadow GL_ARB_fragment_shader GL_ARB_framebuffer_object GL_ARB_half_float_pixel GL_ARB_half_float_vertex GL_ARB_map_buffer_range GL_ARB_multisample GL_ARB_multitexture GL_ARB_occlusion_query GL_ARB_pixel_buffer_object GL_ARB_point_parameters GL_ARB_point_sprite GL_ARB_shader_objects GL_ARB_shader_texture_lod GL_ARB_shading_language_100 GL_ARB_shadow GL_ARB_shadow_ambient GL_ARB_texture_border_clamp GL_ARB_texture_compression GL_ARB_texture_cube_map GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_crossbar GL_ARB_texture_env_dot3 GL_ARB_texture_float GL_ARB_texture_mirrored_repeat GL_ARB_texture_non_power_of_two GL_ARB_texture_rectangle GL_ARB_transpose_matrix GL_ARB_vertex_array_object GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_vertex_shader GL_ARB_window_pos GL_ATI_draw_buffers GL_ATI_envmap_bumpmap GL_ATI_fragment_shader GL_ATI_meminfo GL_ATI_separate_stencil GL_ATI_texture_compression_3dc GL_ATI_texture_env_combine3 GL_ATI_texture_float GL_EXT_abgr GL_EXT_bgra GL_EXT_blend_color GL_EXT_blend_equation_separate GL_EXT_blend_func_separate GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_compiled_vertex_array GL_EXT_copy_texture GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_framebuffer_blit GL_EXT_framebuffer_multisample GL_EXT_framebuffer_object GL_EXT_gpu_program_parameters GL_EXT_multi_draw_arrays GL_EXT_packed_depth_stencil GL_EXT_packed_pixels GL_EXT_point_parameters GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_specular_color GL_EXT_shadow_funcs GL_EXT_stencil_wrap GL_EXT_subtexture GL_EXT_texgen_reflection GL_EXT_texture3D GL_EXT_texture_compression_s3tc GL_EXT_texture_cube_map GL_EXT_texture_edge_clamp GL_EXT_texture_env_add GL_EXT_texture_env_combine GL_EXT_texture_env_dot3 GL_EXT_texture_filter_anisotropic GL_EXT_texture_lod_bias GL_EXT_texture_mirror_clamp GL_EXT_texture_object GL_EXT_texture_rectangle GL_EXT_texture_sRGB GL_EXT_texture_swizzle GL_EXT_vertex_array GL_KTX_buffer_region GL_NV_blend_square GL_NV_texgen_reflection GL_SGIS_generate_mipmap GL_SGIS_texture_edge_clamp GL_SGIS_texture_lod GL_WIN_swap_hint WGL_EXT_swap_control
WGL_EXTENSIONS: WGL_ARB_extensions_string WGL_ARB_pixel_format WGL_ATI_pixel_format_float WGL_ARB_pixel_format_float WGL_ARB_multisample WGL_EXT_swap_control WGL_ARB_pbuffer WGL_ARB_render_texture WGL_ARB_make_current_read WGL_EXT_extensions_string WGL_ARB_buffer_region WGL_EXT_framebuffer_sRGB WGL_ATI_render_texture_rectangle WGL_EXT_pixel_format_packed_float WGL_I3D_genlock WGL_NV_swap_group WGL_ARB_create_context WGL_AMDX_gpu_association

All in all, I am pretty certain I haven't had an issue like this with any other OpenGL application.

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You should try with the recent 3.1.0 beta. There has been some changes to rendering code since 3.0.2 (it was years ago after all) and it may work better now.

from slade.

Works For Me(tm) + three months without further feedback = I'm gonna close this.

from slade.